[jj-config] topics revset, lg and lst aliases, brief template

[jj-config] Remove user-specific config

[shrc] Allow jj repos

[gdbinit.rr] Transmit session ID to subprocesses

[gdbinit] Handle prettyprinting some types better.

[gdb] Massive speedup by enabling parallel symbol loading.

[re-ssh-agent] Find ssh-agent pid from lsof

[mkgist] Update to current gist error handling

[debug] Implement -n N to set the number of cores for rr

[artifetch] Add some job name filtering?

Add in my .config/jj/config.toml file.

[hg] re-enable hg-git so I can push this to github!

[hg] minor improvement to diffpast command

[hg] disable hg-git rather than updating

[hg] experiment with difftastic as external diff tool

[gdb] Shut up some verbose error output, replace with TODO

[gdb log] Document log command options

[rr log] Display (now) in log message list for current "time"

[gdb log] Implement log/d to delete matching log messages

[rr] Implement opts in {expr:opts} during log message substitution