- fixed an issue with dependencies calculation cache validation connected to package masking files changes
- added the ability to get masking reasons
- fixed a bug with picking a buffer
- added support for /etc/entropy/packages/license.mask to allow masking packages by their license identifiers
git-svn-id: http://svn.sabayonlinux.org/projects/entropy/trunk@1264 cd1c1023-2f26-0410-ae45-c471fc1f0318
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