This eases deployment dependencies by allowing Parsoid to supply an
appropriate database category ID so that new lint categories can be
appropriately stored during the interval between adding a new lint
category to Parsoid and deploying an Extension:Linter patch to
describe it.
Change-Id: Ib7b2342168fa53ca2abac7d5f54fe313be341eb7
Move location to two separate columns in the database: linter_start and
linter_end. This allows us to have the database enforce the uniqueness
of those fields, instead of just relying upon the PHP code to do so,
which could be bypassed since we have multiple servers and concurrent
processes.
Change-Id: I3e67ce1b7cb3c93866a388ec3248af4cff2a81e0
