ENH: more succinct output from command-line errors.

- unknown options or missing option values now emit a shorter message
  without the entire usage. This makes it easier to identify the errors
  and is better aligned with the behaviour of GNU system tools.

  ====
     $ simpleFoam -case
     Using: OpenFOAM-plus (see www.OpenFOAM.com)
     Build: plus-01234

     Error: option '-case' requires an argument

     See 'simpleFoam -help' for usage
  ====

- provide for reduced (-help) and full (-help-full) usage information.
  In many cases the reduced usage provided sufficient and easier
  to find the information.

- make -srcDoc an alias for -doc-source

- no warnings about option aliases for future dates.

bin/rmcore

@@ -29,18 +29,17 @@
 #     remove all core files
 #------------------------------------------------------------------------------
 
-# default is pwd
-if [ "$#" -eq 0 ]
-then
-    set -- .
-elif [ "$1" = "-h" -o "$1" = "-help" ]
-then
+case "$1" in
+-h | -help*)
     exec 1>&2
     echo "Usage: ${0##*/} [dir1] .. [dirN]"
     echo "    remove all core files"
     exit 1
-fi
+    ;;
+esac
 
+# Default is pwd
+[ "$#" -gt 0 ] || set -- .
 
 for i
 do