Mac v6 beta test

[Admins]

A new version has been uploaded (v6.032):

- Much faster startup, uses same system as on iOS version: checks for the file where it would download them instead of keeping a file list or scanning everything at startup. In some cases it might download some files again. You can switch to the old system by enabling "Scan Graal folder at startup".
- Less slowdowns when downloading and saving files
- Fixed some problems with tile layers not displaying correctly
- Fixed some problems with downloading of webserver files

A new windows version will come soon, also a new Mac version with Mountain Lion signing.