* src/folderview.c

* src/folderview.c
* src/prefs_folder_item.h
* src/summaryview.[ch]
        o add summary_set_prefs_from_folderitem to set
          summaryview prefs (first step to remove all
          references to the folderitem in summaryview)
        o moved compiled regex stuff from folderitem prefs
          to summaryview code