First release of EasyVVUQ

Initial release, aligned with the M6 release of the VECMA Toolkit.

Basic architecture in place for creating UQ workflows, including elements for:

• reading input defining the parameter space of interest
• Campaign object to record runs required for analysis
• Samplers to create runs required for a given analysis workflow
• creating simulation inputs (Encoders)
• reading and interpreting simulation outputs (Decoders)
• collation of output from multiple runs into a pandas dataframe for analysis
• simple statistical analysis