Commit additional proofreading corrections to APL-IMAGE by Paul Kimpel.

1. Apply typographical corrections to the source from APL/L200013 on the
1972 CUBEA13 library tape.
2. Add APLPTCH.19710305.alg_m patch file with differences between the
APL-IMAGE.alg_m listing and APL/L200013.
3. Add APLPTCH.L200014 patch file from the CUBEA13 tape with changes to
APL/L200013.
4. Update provenance and transcription details in README.txt.

APL-WU-Kildall/APLPTCH.19710305.alg_m

@@ -0,0 +1,6 @@
+DEFINE VERSIONDATE="3-05-71 "#;                                         00000600          
+FILE TWXIN 19(2,30),TWXOUT 19(2,9);                                     00001415          
+    FILL JIGGLE[*] WITH OCT3636363636363636; %RUB OUTS                  00101430          
+$                                                                       00106100          
+                WRITE(TWXOUT[STOP],1,JIGGLE[*])[BREAKKEY:BREAKKEY];     03905206          
+    GO TO ERR1 ELSE;                                                    08017232          

APL-WU-Kildall/APLPTCH.L200014.alg_m

@@ -0,0 +1,6 @@
+$VOID 00040201                                                          00040200          
+$VOID 00101431                                                          00101430          
+$VOID 00232701                                                          00232000          
+$VOID 00241001                                                          00241000          
+    ;LINETOG:=FALSE;TERPRINT;LINETOG:=TRUE;                             00286100          
+$VOID 03905208                                                          03905216          

APL-WU-Kildall/README.txt

@@ -1,21 +1,76 @@
 APL\B5500
 
 APL interpreter for the Burroughs B5500, written by Gary Kildall (of
-CP/M fame), Leroy Smith, Sally Swedine, and Mary Zosel at Washington
-University (Seattle, Washington, US) in the early 1970s. This version
+CP/M fame), Leroy Smith, Sally Swedine, and Mary Zosel at the University
+of Washington (Seattle, Washington US) in the early 1970s. This version
 was modified by Jose Hernandez of Burroughs Corporation for operation
-under the Timesharing MCP.
+under the standard Burroughs Timesharing MCP (TSSMCP).
 
 APL-IMAGE.alg_m
-    The source of the APL interpreter. This was transcribed from a
-    photocopy of a listing donated by Ed Vandergriff of Chaska,
-    Minnesota, US. According to Ed, this listing probably originated
-    from the Georgia Institute of Technology (Georgia Tech) in Atlanta,
-    Georgia, US.
+    The source of the APL interpreter, written in Burroughs B5500
+    Extended Algol, dated "1-11-71" (1971-01-11) in the source. This was
+    transcribed from a photocopy of a listing sent to Paul Kimpel by Ed
+    Vandergriff of Chaska, Minnesota US. According to Ed:
+
+        "Originally this came from a long-ago colleague, George P.
+        Williams (then of Huntsville, AL [Alabama US]) who shared my
+        interests in computer architecture and language implementation;
+        if I recall correctly he encountered it as a student at Georgia
+        Tech."
+
+    A scan of that listing is available from:
+    http://bitsavers.trailing-edge.com/pdf/georgiaTech/APL-B5500-Listing
+    -19710111.pdf
 
     Transcription was performed jointly by Hans Pufal of Angouleme,
     France and Fausto Saporito of Naples, Italy during August-September
     2013. Proofreading, corrections, and application of original
-    sequence numbers was done in late 2016 by Richard Cornwell of
-    Durham, North Carolina US.
+    sequence numbers (the last digits of which are often obscured on the
+    listing) was done in late 2016 by Richard Cornwell of Durham, North
+    Carolina US.
+
+    In May 2018, three CUBE (Burroughs user organization) Library tapes
+    were successfully read by the Computer History Museum in Mountain
+    View, California US, and made available to a few B5500 enthusiasts.
+    On the CUBEA13 tape is the file APL/L200013 (creation date
+    1971-03-08), which appears to be a slightly later version of the
+    program, dated 1971-03-05 in the source. Paul Kimpel of San Diego,
+    California US used this machine-readable version to correct left-
+    margin indentation, last digits of sequence numbers, and numerous
+    typographical errors that had escaped detection during proofreading.
+
+APL-IMAGE-List.lst
+    Compilation listing of APL-IMAGE.alg_m. This was compiled using Mark
+    XIII Algol using the following deck:
+
+        ?COMPILE 0APL/DISK ALGOL LIBRARY
+        ?ALGOL STACK=1000
+        ?ALGOL FILE NEWTAPE=NEWSYM/APL SERIAL
+        ?DATA CARD
+        $CARD LIST SINGLE NEW
+            <source images from APL-IMAGE.alg_m
+        ?END
+
+    The "0APL" MFID is necessary in order to be able to execute the
+    codefile under CANDE as APL/DISK.
+
+APLPTCH.19710305.alg_m
+    A patch deck containing the few differences between the 1971-01-11
+    version of the source archived here and the 1971-03-05 version on
+    the CUBEA13 library tape.
+
+APLPTCH.L200014.alg_m
+    A patch deck for the APL.L200013 source on the CUBEA13 library tape.
+    This should be applied to APL-IMAGE.alg_m after the
+    APLPTCH.19710305.alg_m patch above.
+
+    The 1971-01-11 and 1971-03-05 versions both print two question marks
+    ("??") at the end of each line of terminal output. These appear to
+    represent a carriage-return/line-feed pair appended to the end of
+    messages by the program, but translated to question marks by the
+    TSSMCP before being sent to the terminal. This behavior appears to
+    be something that was missed in the conversion of the APL program
+    from the custom data communications handler used by the University
+    of Washington at the time to the standard Burroughs TSSMCP. This
+    patch removes these extra characters from output messages.