Colours: fixed the reds and fixed bug when ssh'ing

It appeared the colors terminal property isn't quite right in login shells
over ssh leading to it spamming the Linux framebuffer setup. This is no
good.
Tmux/Screen: Set window title using the proper calls

No need for escape sequences here (less spammed to the terminal).
Bash: Jobs info in prompt corrected to use \[ \] for non-printed parts
Git: rebase shortcuts added, git-unpushed added to show unpushed changes