* Made setting PYTHONPATH environment variable portable

Added tag 0.7 for changeset c73ba49c3ccb

> Stabilized 0.7

+ Added reduction graphic for documentation.

* Fixed argument passing. + Added logging in documentation.

* Preparing 0.6.2 release

Preparing 0.6.1 release

Added tag 0.6.1 for changeset 0c313887db7a

Prepare package for release

fix global debug vars and import control