[ENHANCE] Make extension column optional in vertical file switcher (in progress).

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1168 f5eea248-9336-0410-98b8-ebc06183d4e3
[UPDATE] Remove an incorrect character.

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1169 f5eea248-9336-0410-98b8-ebc06183d4e3