[Swift-devel] language behaviour tests

[Ben Clifford]

In r891 I put in some language behaviour tests in 
tests/language-behaviour/

These run a bunch of small SwiftScript programs locally and check that 
they output expected text - for example, checking that @strcat really does 
concatenate, that + really does add, and other such things.

I built them for testing various changes I've been playing with at the 
language parsing and compilation layer.

Previously I was using the tests 
in tests/language/ for testing parser changes.

The language/ tests check that input SwiftScript always produces the same 
.xml intermediate form, whilst these new tests check that the input 
SwiftScript always produces the same output (in a file) on execution, 
without regard to whether the .xml and .kml intermediate files take a 
different form or not.

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