Add Faisal Anees as authors
Issue #7537: Add is_disjoint() method and an alias isdisjoint()

Add a method for finding if two sets are disjoint.
Make Egyptian fractions a little more robust.

Add checking for negative arguments, and arguments > 1
Add check for legal input in egyptian fraction.

Reject numbers outside of (0,1), instead of trying to handle them.
Add Golomb's method for Egyptian fractions.
Use harmonic method for Egyptian fractions

Sum divergent series for values > 1.