This is a startup script for ksh93.
Inspired by http://aperiodic.net/phil/prompt/ , it defines a fancy two
lines prompt.  If we're under a git repository, the current branch
appears in the right prompt,  otherwise it's the current date.
It also redefines cd using a stack.
* README: this file.
* bin: directory containing some utility scripts.
* funcs: directory containing various utility functions for ksh.
* kshrc: startup file for interactive shells.
* profile: startup file read by a login shell.
* screenrc: GNU screen startup file.
* install.sh: install the various files and scripts.  It also adds
cleanhist to a user crontab.