Feature Request: Robust Error Handling

[ElijahSwiftIBM]

Is your feature request related to a problem? Please describe. -pyRACF ignores unknown fields and traits passed into it, this can cause problems if output it not closely monitored for validation -pyRACF also allows "bad" or "invalid" data types to be passed to RACF, which will throw a security request error on failure -pyRACF's ADD and ALTER requests are not mutually exclusive. ADD can inadvertently ALTER existing users, and ALTER can create new ones

Describe the solution you'd like -pyRACF should validate these fields and traits, and throw errors for unknowns -pyRACF should throw its own errors for obviously invalid data before it is passed to RACF -pyRACF's ADD and ALTER functions should check to ensure ADD will not ALTER an existing user and ALTER will not ADD a new one

Additional context IRRSMO00 has a flag for TERMINATE ON FIRST ERROR which will likely stop ADD from altering an existing user as long as ADD does not use the PRECHECK flag.

[lcarcaramo]

Resolved by #26 and #27