pkg: rewrote the install process We now have a single extension. - enable is dropped - a setup.py is added - the doc is updated to reflect this

syntax: re
/figures/[^/]+\.png$
^docs/build/
^docs/html/
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
\.err$
^tests/easy_run.sh$
^build/