Restore REM.CM to be separate file from greet file; Enable chaining of medley runs using REM.CM file (#2027)

- Fixed INTERPRET.REM.CM so that it no longer tries to load the file pointed to by LDEINIT and instead loads the file pointed to by LDEREMCM. 
 LDEINIT remains the file used by greet. 
- Adjusted the medley script to have a new argument -cm (or --rem.cm) which sets LDEREMCM as appropriate before launching lde.  
- Updated the loadup scripts as required to use this new -cm argument when calling medley. 
 Finally, added a new feature to the medley script -cc (or --repeat) whereby which when medley finishes it checks for a nonzero file given as the argument to -cc.  If that file exists, medley is run again (i.e., repeated) with LDEREMCM set to that file.  This repeats until this file no longer exists or is zero-length.  The file can be found as the vale of LDEREPEATCM so that each invocation of medley can modify (or delete) this file so as to change the subsequent run of medley.

scripts/loadup-setup.sh

@@ -72,6 +72,7 @@ touch "${LOADUP_WORKDIR}"/loadup.timestamp
 
 script_name=$(basename "$0" ".sh")
 cmfile="${LOADUP_WORKDIR}/${script_name}.cm"
+initfile="${LOADUP_WORKDIR}/${script_name}.init"
 
 # look thru args looking to see if oldschool was specified in args
 j=1
@@ -153,13 +154,14 @@ loadup_finish () {
 run_medley () {
   if [ ! "${LOADUP_OLDSCHOOL}" = true ]
   then
-    /bin/sh "${MEDLEYDIR}/scripts/medley/medley.command"  \
+    /bin/sh "${MEDLEYDIR}/scripts/medley/medley.command"         \
              --config -                                          \
              --id loadup_+                                       \
              --geometry "${geometry}"                            \
              --noscroll                                          \
              --logindir "${LOADUP_LOGINDIR}"                     \
-             --greet "${cmfile}"                                 \
+             --rem.cm "${cmfile}"                                \
+             --greet "${initfile}"                               \
              --sysout "$1"                                       \
              "$2" "$3" "$4" "$5" "$6" "$7"                       ;
     exit_code=$?