* less punctuation: replace brackets with a single letter around battery, load, nothing around jobs and return value
* avoid extra spaces
* uncolored punctuation
* color the prompt mark in red if root, else in bold white
* user in light white and working dir in bold white
* modular function for building the prompt from the othe functions
* use tput for colors, everywhere
* show the standing commit numbers
* support branches without remote
* check if a battery is present
* show error codes of previous commands
* use ± as the prompt mark within git directories
* somewhat different colors
