fixed VCS tests after executable big issue was fixed

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extra : source : dbe9a08b2bcfb73a7dafac02ae0885bba9a698e7
Version bump and updated changelog for 1.6.0 final release

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extra : amend_source : 725eee39cd76af3aa1f7234afdacf2e78b6212a8
Added tag v1.6.0 for changeset 78b53ee0d247
bumped version in stable branch
Repo type can't be changed. Fixes issue 836
fix required repo_type param on repo edit form

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extra : amend_source : ea5e59cfe6f88aa4abe00cfa2b209918e66f9c10