[entropy.db] rewrite needed libraries SQL schema, keep compat.
Update package-hashes to default to sha256 gpg
Merge pull request #9 from kpcyrd/master

Update package-hashes to default to sha256 gpg
[solo.commands.pkg] EEXIST is fine when using makedirs()
[entropy.db.sql] fix typo in SQL in resolveNeeded
Release Entropy 286
Tagging Entropy version 286
[entropy.client] equo unused that works more like emerge --depclean

Almost done, but there are comments with things I'd like to get
feedback about.
[entropy.client] updates to unused.py after review
Merge pull request #10 from Enlik/master-like-depclean

improved 'equo unused' algorithm