Some changes to perham3pla. Mainly making the documentation nicer
Some minor improvements throughout src/perham3pla.py
- Making the documentation of PerHam3pla and PerHam3pla.angle more compact and nicer to read
- Putting the default value of verbose to False
- Intercepting all cases for which k1n1 + k2n2 + k3*n3 cannot be zero when keplerian = True