Integrate PICT as a covering array generation engine

[dakusui]

PICT is the most popular tool for Combinatorial Interaction Testing (CIT).
It can generate a covering array from a text file described in its own human-readable notation.
It was developed by Jacek Czerwonka and is now an open-source project from Microsoft.

JCUnit 0.10.x (or later) uses PICT for covering array generation for the part (factors) it can be used and then combine it with another covering array generated by JCUnit's internal covering array generator for the rest. (using the "combinatorial join" technique.

https://github.com/microsoft/pict