CONFIG: improve shell env handling of paths with spaces (#1007, #1008)

- foamCleanPath now only splits the environment variable on ':', which
  allows other directories with spaces or '(..)' etc to pass through
  without major issue.

- The filter arguments are split on whitespace, colons or semi-colons.

etc/config.sh/ADIOS

@@ -37,7 +37,7 @@ export ADIOS_ARCH_PATH=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$adios
 
 # END OF (NORMAL) USER EDITABLE PART
 #------------------------------------------------------------------------------
-if [ "$FOAM_VERBOSE" -a "$PS1" ]
+if [ -n "$FOAM_VERBOSE" ] && [ -n "$PS1" ]
 then
     echo "Using adios ($adios_version)  ->  $ADIOS_ARCH_PATH" 1>&2
 fi