Composite test filter

[DurieuxPol]

Added MTCompositeTestFilter to combine several test filters.
Use it by giving a collection of filters:

MTCompositeTestFilter for: {
		(MTBlockTestFilter for: [ :testCase |
			 testCase selector beginsWith: 'testX' ]).
		(MTPragmaSelectionTestFilter for: #pragma).
		(MTTimeTestFilter for: 10 milliSeconds) }

Also simplified tests for test filters

[guillep]

Could you add a class comment? Does this filter filters if ALL filters say so, or if ANY filter does it? I assume it should be ANY (otherwise it will be unusable, right?)

[DurieuxPol]

It filters if any filter does. It's as if the tests collection passes through each filter one by one.
I'll add a class comment

[guillep]

Good!