kernel: Add ContextPart>>#printContextState

Print context args and temps names and their value while inspecting
them and add a unit testing in kernel-tests.

2013-08-20  Gwenael Casaccio <gwenael.casaccio@gmail.com>

	* kernel/ContextPart.st: Add ContextPart>>#printContextState,
	>>#examineOn: and various helper methods for inspecting the
	context.

2013-08-20  Gwenael Casaccio <gwenael.casaccio@gmail.com>

	 * kernel/ContextParTests.st: Add tests for ContextPart