Refactoring WHERE processing and AND parsing bug fix for lower case "and".

Nondestructive first step to refactor WHERE processing to a reusable file for DELETE and [before making] UPDATE.  Used only by the SelectCommand currently.  DELETE will need slight refactoring of SelectParts.
Destructive version of previous checkin.

Removed code from SelectCommand that's been moved to the WhereProcessor.  Made OperativeName public to use in SelectCommand, though the take-home is that that logic possibly belongs in TableContext/elsewhere.