bash: rain: comments
bash: rain: alias tty-clock
bash: rain: remove always-true systemd check

This stopped being relevant long before Arch dropped sysvinit support.

(My test Ubuntu partition is not affected, as it has a different
hostname. Though this reminds me that maybe I should symlink it to
bashrc-rain, and re-add this check... if I ever actually /boot/ into
that thing. Also, update it to check /run/systemd or whatever
libsystemd-daemon uses nowadays.)
bash: warn if loading .environ

Helps me spot config errors, as this shouldn't happen normally.
hgrc: use $NAME alongside $EMAIL
bash/prompt: document everything