Switched Tests to use .-based accessors

Switched InchCoordProxyTests and InchLocationTests from using getter and setter methods to the dot-notation setters and getters.  The “#pragma clang diagnostic ignore” lines that were recently added to each model's P001ModelSurrogate category make this possible without any warnings or errors.

Minor: Moved object sets in InchLocationTests#testXYSurrogation to inside the brackets, matching InchCoordProxyTests's format.

Note: This turns the mistake that we've been calling setters on surrogates for a while now (which are by nature readonly) into a hard error.  Which is good, but bad. YKWIM