There are two main problems in the existing Fossil autocompletion that this
patch solves:
* Because Fossil lacks an alias system similar to those in Hg and Git,
wrapper scripts are common, and aliasing them to `fossil` is also fairly
common. The lack of the `command fossil` pattern in the completions script
meant that the actual fossil command might not be called, but rather the
alias. This problem has been fixed by introducing a __fish_fossil command,
similar to the __fish_hg and __fish_git commands in those completion shells,
that does this, and converting all explicit fossil calls in the completion
script to use __fish_fossil instead
* Because there's now a centralized location for calling Fossil, I also moved
all of the repetitive stderr redirects that function.
This results in more robust and cleaner code.
Bit one: Make all the fossil command invocations throw away stderr so we don't
get annoying messages when not in a repository.
Also:
- Move checkout into alphabetical order.
- Fix ls to complete against tags for -r option, not no option.
- Add missing option to delete command.
- Make commit complete against modified files.
- Make add only complete against extra files.
- Remove now ununused function to list extra & modified files.
- Add -f option in a number of places where it seemd appropriate.
