* Replace remaining calls to testing.Short where possible.
* Update style guide.
* Revert change in TestAlertmanager_ExtraDedupStage, as it doesn't work.
* Make TestAlertRulePostExport into integration test.
* streamline initialization of test databases, support on-disk sqlite test db
* clean up test databases
* introduce testsuite helper
* use testsuite everywhere we use a test db
* update documentation
* improve error handling
* disable entity integration test until we can figure out locking error
Peter Štibraný
Mariell Hoversholm
Anton Patsev
Dan Cech
b murphy
Santiago
Sofia Papagiannaki
Emil Tullstedt