index: fix filemapping on Windows
Merge pull request #1 from pmezard/windows-filemapping

index: fix filemapping on Windows
mmap/mmunmap and file cleanup from upstream issues
Fix unmmapFile on BSD/Mac
Document csearch flags better
Shortcut max file size check
Added -indexpath flag for overriding $CSEARCHINDEX
Added some Mac OS X specific path ignores
Don't add invalid utf-8 trigram + minor code rearrange
csearch: Added the -m MAXCOUNT option
Added Bittorrent Sync and Dropbox cache/metadata to ignores