This addresses a bug in the module code so far committed. The problem is that changin...

This addresses a bug in the module code so far committed. The problem is that changing the modules used would update the Buffer's TextClass---but it wouldn't update the layouts used by existing paragraphs, the way changing the TextClass does. The solution, obviously, is to do that update. So what I've done is extract that logic from LFUN_TEXTCLASS_APPLY into an updateLayout() routine and then call that from LFUN_BUFFER_PARAMS_APPLY, LFUN_LAYOUT_MODULE_ADD, and LFUN_LAYOUT_MODULES_CLEAR, which are the three places the modules could be changed.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@19964 a592a061-630c-0410-9148-cb99ea01b6c8