sys-bio/roadrunner: v2.2.0

Version 2.2.0 of libroadrunner has a variety of updates, including: Now uses LLVM13, providing faster compilation and execution of models. Also provides an entirely new JIT system (ORC-JIT) which in our hands has proved faster than the previous MC-JIT. MC-JIT is still the default, but switching to ORC-JIT can be enabled in the options; in future releases, ORC-JIT will likely become the new default, once we're sure that no unexpected problems emerge. Various speedups have been incorporated to increase the speed of model loading, including streamlined parsing of the SBML, and using a new version of libSBML for model access for some functions. Parallelizing roadrunner is now more robust. A bug was fixed (https://github.com/sys-bio/roadrunner/issues/910) where the calculated Jacobian would sometimes be incorrect if the initial compartment volumes were changed. A bug was fixed where roadrunner would incorrectly refuse to calculate certain elasticities