v0.1.6

Added

• Added the ParallelModel class as an easy abstraction over the joblib library for parallel computation.
• Added an aggregate_parallel_metrics function to make using metrics in parallel easier.
• Added MTEQE

Changed

• Split Prism into reference-based Prism and reference-free PrismSrc.
  They now support multi-reference and multi-source via averaging over the references/sources.
• Relaxed the dependency on pytest so it does not require a specific version