bashrc: document why Debian bash causes the warning
Xres: whitespace
Xres: do not set XTerm*utf8

Much like `uxterm` or `xterm -u8`, forcing this value to be enabled only
hides the problem of misconfigured locale.
Xres: disable rxvt plugins
Xres: clean up xterm
git: re-add gui.config (fixed in Tig.git)
ssh: add alias for decay
ssh: hosts (+ decay)