issue1419: catch strange readline import error on windows

Merge with crew-stable

util: disable walkrepo() recursive behaviour Revert b1aea76f700 and 268c582bd42a for performances reasons. Traversing checkout working directories may be too expensive.

Fix Bugzilla integration to work with new Bugzilla 3.2. Bugzilla 3.2 changes the type of all MySQL tables it uses from MyISAM to InnoDB. MyISAM does not support transactions, and performs an implied commit after each update. InnoDB does support transactions, and so exposes a bug where changes to the Bugzilla database were not committed, and so with 3.2 are lost when the database connection closes.

tests: test-walkrepo shouldn't throw SystemExit Write to stdout instead of throwing Exceptions

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