rhg: Rename cat_file_is_modified It hasn’t been based on the "cat operation" for some time already. Differential Revision: https://phab.mercurial-scm.org/D11773

rhg: Also parse flags in the manifest parser Differential Revision: https://phab.mercurial-scm.org/D11772

rhg: Propogate manifest parse errors instead of panicking The Rust parser for the manifest file format is an iterator. Now every item from that iterator is a `Result`, which makes error handling required in multiple new places. This makes better recovery on errors possible, compare to a run time panic. Differential Revision: https://phab.mercurial-scm.org/D11771

tests: Adapt test-basic.t expected output for rhg Differential Revision: https://phab.mercurial-scm.org/D11769

rhg: Colored output is not supported Fallback if it is requested explicitly. The default is documented as use color "whenever it seems possible". rhg proceeds without color in that case. Differential Revision: https://phab.mercurial-scm.org/D11762

rhg: [encode] and [decode] config sections are not supported Differential Revision: https://phab.mercurial-scm.org/D11761

rhg: Config commands.status.terse is not supported Differential Revision: https://phab.mercurial-scm.org/D11760

rhg: Propagate config errors in `rhg status` This code was calling `Result::unwrap_or` instead of `Option::unwrap_or` as was presumably intended. Differential Revision: https://phab.mercurial-scm.org/D11759