Srlife

This release adds two large new features:

- A thermohydraulic solver. Now you can define flow paths through the receiver along with flow path inlet temperatures and flow rates and srlife will solve for the resulting fluid and tube temperatures. This eliminates the need for an external thermohydraulic solver.
- Time independent, statistical failure models for ceramic materials. srlife can now evaluate the reliability of ceramic receivers and other CSP components!

This release also includes the data required to analyze components made of monolithic SiC as well as new fluid properties for supercritical carbon dioxide working fluids.

The new version of scikit-fem uses a decorator that makes it's objects un-pickle-able, meaning they don't play nicely with multiprocessing. This release works around the incompatibility by pinning srlife to version 3.2 of scikit-fem.

This version includes:

- Fixes and improvements suggested by ANU and others
- Solver heuristics, aimed at speeding up the analysis with some reduction in accuracy
- Minor updates to the material models

This release fixes a couple of bugs in the system solver. These bugs should only have affected "partly connected" receiver models and should not have affected fully connected or fully disconnected simulations.

This bugfix resolves an issue introduced by pinning srlife to a particular version of numpy.

This version adds MacOS support and official install directions.