Place built image files in separate directories for each target.

Also move generated CONFIG > and SYSHST > files from the "src"
directory to "out".

This facilitates parallel builds, and deploying image files.

build/simh/boot

@@ -2,5 +2,5 @@ set cpu its
 set cpu idle
 set tim y2k
 set rp0 rp06
-at rp0 out/rp0.dsk
+at rp0 out/simh/rp0.dsk
 b rp0

build/simh/build.tcl

@@ -1,4 +1,5 @@
 set build [pwd]/build
+set out "out/$env(EMULATOR)"
 set emulator_escape "\005"
 
 proc start_salv {} {
@@ -14,7 +15,8 @@ proc restart_nsalv {} {
 }
 
 proc start_dskdmp {} {
-    respond "sim>" "at tu2 out/dskdmp.tape\r"
+    global out
+    respond "sim>" "at tu2 $out/dskdmp.tape\r"
     respond "sim>" "b tu2\r"
     respond "MTBOOT" "\033g"
 }

build/simh/init

@@ -1,6 +1,6 @@
 set cpu its
 set tim y2k
-at tu0 out/minsys.tape
-at tu1 out/salv.tape
+at tu0 out/simh/minsys.tape
+at tu1 out/simh/salv.tape
 set rp0 rp06
-at rp0 out/rp0.dsk
+at rp0 out/simh/rp0.dsk