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Fix minor flaw. Ret was not evaluated. This would theoretically make programs that crash in  the return expression valid

Add config scripts and current state README contains instructions on installing and running hol-light

Post condition parsing

- Parses the post conditions written in the 'ensuring' clause, and stores them in the context

See merge request !4

External error functions trait

Can be used at multiple places now, not just hardcoded in the Range error phase

See merge request !2

- positions are now copied, and used for div-by-zero and neg-sqrt reporting
- typos in one benchmark
- enabling sqrt finally by adding the sqrt methods for Rational, although it still is not optimal and may fail