Azren/rebased chunks You can specify a place to start and finish doing the compression

[Azrenbeth]

Added two options:

• a start group (with -s START)
• the number of groups to work on (with -n NUMBER)

This should deal with the excessive memory problems people have been reporting.

(NOTE: this changes the meaning of the -s flag to mean START state group and not STOP state group)

Also adds in unit testing and an integration testing framework

[Azrenbeth]

Pull request made from wrong position in graph...