Update.

- add functions for easy bin2dec and dec2bin conversion
- lower indent depth
- use [[ instead of [
- use mini theme below 80 colums
- don't hardcode Ruby version in PATH
- print /etc/motd only on /dev/pts0
Add alias to simplify subberthehut usage.
Don't print MOTD on pts/0.
Add -Wpadded to gcc aliases.