Allow custom messages in IncompatibleModelError

[michaelbynum]

Summary/Motivation:

The new direct interface to Gurobi attempts to pass a custom message to IncompatibleModelError here:

pyomo/pyomo/contrib/solver/solvers/gurobi_direct.py

Line 273 in 32591c1

raise IncompatibleModelError(

. However, that exception does not currently except custom messages. This PR enables custom messages.

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[mrmundt]

Suggested change

	+ 'the model and solver.'
	'the model and solver.'

Fun fact: you don't need the +.

[mrmundt]

I think this is a good change but can we do it for all of the custom error messages? E.g., for NoReducedCostsError, NoDualsError, etc.