rebase_migration: Unapply migrations while rebase. #346
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Previously, while rebasing migrations, if the migration to be rebased is already applied, it would throw out an error asking to un apply the migration before rebasing.
This commit un applies the migrations and rebases them when the migrations to be rebased are already applied. This is done by first creating a --merge migration, un applying the previous migrations, removing the --merge migration, and then rebasing the existing migrations.
This is extracted from #343.
Fixes #184