alien,stack-checker.alien: new word with-callback

Since callbacks aren't automatically deallocated this word intends to
make sure "inline" callbacks are.
alien.tests: fix the test cases so they dont leak, and new tc for with-callback
compiler.tests.alien: use the with-callback combinator to plug the memory leaks in the tests
compiler.cfg.stacks.local: Have unit test load prettyprint implementation for ds-loc so that it always prints as "D 4".