Merge pull request #2 from Chouche/master

Fixed the inverted condition in toggle_read_only.
Only use $wgDB* variables if they're the first thing on the lines. Prevents picking them up (especially $wgDBname) from other uses.
Adds a 'complete filesystem' backup method, calls it instead of just saving the images subdir.
Merge branch 'master' of github.com:samwilson/MediaWiki_Backup
Adds a '-c' option flag, that switches to complete install-dir dump instead of 'images' only dump. Writes a more details usage.
Saves the DB charset in the database-archive filename.