Carlo Landmeter authored Jan 10, 2018 and Carlo Landmeter committed Jan 24, 2018

- split databases into branches
- change relation of pkg vs flagged status
- added migration script to migrate to new flagged table format
- added new provider_priority field to apk header
- add settings for default branch and arch
- make edge the default branch in packages list
- add SQL debug option in config
- remove uneeded usage of class
- move all utils to utils.lua
- optimize SQL queries
- re-factor importer script
- allow to change http listening port via environment
- linted with luacheck and added .luacheckrc

This commit changes how we handle databases. Instead of having
everything in a single sqlite database we split each branch into its own
sqlite database. This will limit the amount of rows in the pkg/file per
table and improve performance.

Flagged table has been redesigned. This redesign uses a composite index
(repo,origin,version) so the packages table is now related to this index
which makes it possible to remove the current flag id col...