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 column. This also
introduced the updated column to be able to unflag a package and make it
unlisted on flagged listing but still be able to show the status on
individual packages when some archs are behind. Every time packages are
updated the unique triple will be looked up in the flagged table and
updated/unflagged when found.

Migration is handled by the migrate_v2.lua script. It needs to be run
against the old single aports.db and will generate a single flagged.db.
The flagged.db can be renamed to aports-edge.db after which the import
script can be run to start generating the splitted aports-branch.dbs.
Some settings need to be updated from the provided sample config ie
the db location is changed to a path instead of a file and the apkindex
format is now defined in config instead of hard coded in multiple places.