Summary
- tuned mirabelle documentation
- removed support for obsolete prover SNARK and underperforming prover E-Par
- removed spurious documentation item
- removed obsolete unmaintained experimental prover Pirate
- tune filename
- drop obsolete ad hoc support for Satallax isar proof reconstruction
- recognize THF proofs properly
- factored out bit comprehension
- Fix formatting of default value in help message of "build_e" component.