config: set a 'source' in most cases where config don't come from file but code Some extensions set configuration settings that showed up in 'hg showconfig --debug' with 'none' as source. That was confusing. Instead, they will now tell which extension they come from. This change tries to be consistent and specify a source everywhere - also where it perhaps is less relevant. [ original upstream message ]

Merge with stable

run-tests: move from dict() construction to {} literals The latter are both faster and more consistent across Python 2 and 3. [ original upstream message ]