rhg: Add support for `rhg status -n` The `RHG_STATUS=1` bit added here can be removed when `unset RHG_STATUS` near the top of the file is removed. Differential Revision: https://phab.mercurial-scm.org/D11815

filemerge: simplify slightly by using filectx.decodeddata() Differential Revision: https://phab.mercurial-scm.org/D11802

filemerge: rename _formatconflictmarker() since it formats a label `_formatconflictmarker()`'s name made me think that it would create something like `<<<<<<<` and maybe some more stuff after it, but it's actually just the label that comes after on the same line. So let's rename it to `_formatlabel()`. That's better aligned with the variables the result is assigned it. Differential Revision: https://phab.mercurial-scm.org/D11801

tests: fix test-fix on NetBSD Differential Revision: https://phab.mercurial-scm.org/D11816

rhg: Fix status desambiguation of symlinks and executable files Differential Revision: https://phab.mercurial-scm.org/D11774

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