Shared files

[NacreData]

Significant structural change - consolidate per-user indexes into one index, use inserted file attributes to filter results based on permissions.

Would love to see some close scrutiny and probably correction so that it can be committed and maintained.

[mention-bot]

By analyzing the blame information on this pull request, we identified @butonic, @DeepDiver1975 and @nickvergessen to be potential reviewers

[NacreData]

Not sure what's up with "scrutinizer" and the Zend libraries. I'll try to figure it out when I get a chance.

[butonic]

deprecated by #121