Oasa library

See http://bkchem.zirael.org/oasa_en.html
.gitignore
Makefile
Initial codebase at 0.13
Documentation
Refactor file parsing.
Update version to 0.14.0
Remove oasa library added in #3170ca7
Replace own code with openbabel

Openbabel (openbabel.org) offers parsing of various format and the
possibility to obtain bond length, angle, etc. directly.

Using Openbabel allows to remove large portions of the codebase and to
turn vibeplot into a much simpler Openbabel wrapper.
Update documentation
Update version to 0.14.1
Add orbimol database

See http://www.lct.jussieu.fr/pagesperso/orbimol/fr/index-fr.shtml
Update documentation.
Add Orbimol DB to setup.py
Add support for Orbimol + fixes
Update documentation.
Update version to 0.14.2
Update documentation.
Add openbabel dlls to setup.py
Smarter format guessing