- Added a test in configure for the version of libPropList that is installed

on the system. Further compilation will be aborted if the version of
  libPropList that is found is older than expected. Hopefully this will make
  go away some annoying messages from people unable to read the release
  notes.
- Implemented periodic synchronization of user defaults in WINGs and
  notification when user defaults gets changed.
- Fixed the color panel to compile (someone in charge with it check if its
  ok, I only changed where the compiler complained, didn't go through the
  code).
- Misc fixes, related to latest changes in wrlib.

configure.in

@@ -507,6 +507,20 @@ if test "x$LIBPL" = "x"; then
    exit 1
 fi
 
+WM_CHECK_PROPLIST_VERSION(0.9.5, goodlPL=yes, goodlPL=no)
+
+if test "$goodlPL" = no; then
+   echo
+   echo "ERROR!!! libPropList is an old version. Please consider upgrading"
+   echo "         to at least version 0.9.5. Older versions have bugs that"
+   echo "         may cause Window Maker to crash randomly."
+   echo "         If your libPropList is older than 0.9.2 it will also prevent"
+   echo "         Window Maker from compiling because new functions were"
+   echo "         introduced since that version."
+   echo "         Please read INSTALL to find where you can find libPropList,"
+   echo "         and upgrade it before you proceed."
+   exit 1
+fi
 
 AC_SUBST(LIBPL)
 
@@ -791,7 +805,7 @@ fi
 dnl Enable User Defined Menu thing
 dnl ==================================
 AC_ARG_ENABLE(usermenu,
-[  --enable-usermenu      user defined menus for applications
+[  --enable-usermenu       user defined menus for applications
 ],
 if test "$enableval" = yes; then
 	AC_DEFINE(USER_MENU)