cleanup of foam-pack scripts

- removed legacy foamDiffSourceList, foamPackChanged
  - added foamPackDoxygen for separate distribution of docs
    handles -prefix option
  - misc. cosmetic changes

bin/foamPack

@@ -43,7 +43,8 @@ then
 fi
 
 # add optional output directory
-if [ -d "$1" ]; then
+if [ -d "$1" ]
+then
    packFile="$1/$packFile"
 fi