[WIP] Refactor

- use cowbuilder to build
- use eatmydata to speed up build
- use options to speficy build ARCH and DIST
- use tmux to run multiple build
Move hooks dir out of pbuilder/
Update .gitignore
Cosmetics
Add kp subcommand to kill other panes in tmux
Create symbol links in prepare
Add gbp.conf
Use $HOME/.pbuilderrc in update/create/login
Make nc(new changelog) smart

if the current $version string contain current $branch
then $version++
else ${version}+${branch}1
Reorder subcommand to follow work flow
No need to clean and exit
Set default string appended to $version
Link ./dr to ~/bin/
Rename pbuilder.sh to dr
Move err function and remove date prefix
Only load var from ~/.pbuilderrc
Rename prepare to init, do more staff

- detect REPO_BASE
- handle REPO_BASE var in pbuilderrc
Run init if REPO_BASE not changed
Short command for subcommands
Add .gitattributes