.screenrc: $TERM="screen"

Go back to using TERM=screen for screen sessions. Never ended-up
needing 256-color support, and having TERM=screen allows for writing
scripts that have handling specific to screen-sessions.
bin/ipaddr: Support AIX
bin/git-subup: Better compatibility with older Git versions
.term_colorpalette: Slightly lighter brblack
.bashrc: Add "settitle" function for setting screen title

Use the "Set Window Title" escape sequences which GNU screen
respects to set the current window title. This could be handy to
write scripts to automagically change the window-title, e.g. when
ssh'ing to a new machine.