grep: search working directory files by default if --all-files is specified
The default was -rtip:0 before, but "--all-files -rtip:0" would be the most
useless combination, and it isn't supported yet. Let's change the default to
something useful.
This isn't flagged as BC since --all-files isn't released.
Differential Revision: https://phab.mercurial-scm.org/D3917
grep: reject --diff --all-files
This combination doesn't make any sense since --diff is the flag to search
change history, whereas --all-files is to include unmodified contents.
Differential Revision: https://phab.mercurial-scm.org/D3916