[BUG_FIXED] Fix undo actions on unsaved snapshot file removing the dirty state bug.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1304 f5eea248-9336-0410-98b8-ebc06183d4e3
[BUG_FIXED] Fix a crash issue while the opened document is deleted/moved from outside.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1305 f5eea248-9336-0410-98b8-ebc06183d4e3
[RELEASE] Notepad++ 6.7 Release.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1306 f5eea248-9336-0410-98b8-ebc06183d4e3