removed unused function GetRecursiveDirsListing
modified GetRecursiveListing to accept directory flags
added 'proof' and 'subs' to movie excludefromscan expression
modified fasthash method to incorporate the exclude from scan expressions and return a md5 hash
recursive fasthash for enumerating series folders
don't hit an already processed series folder twice
added: CPosixDirectory implementation
changed: avoid useless filesytem io while searching for subtitles