add constantExpressions test cases from golang spec
Merge pull request #990 from bronze1man/pr-test2

add test case for #989
Merge pull request #987 from bronze1man/pr-test1

add constantExpressions test cases from golang spec
Don't create a presentation for broken elements.

Fixes #985
Enable remaining failing tests
Merge pull request #851 from dlsniper/other-tests

Enable remaining failing tests
Updated the return inspection

Fix #989.
But broke others.
Fixed one constant computation test
Fix failing test
Some cleanups and small refactorings with the type system.
Fixed a couple of conversions tests.
Revert a bunch of changes related to constants representability.
Changed the way type resolution works in conversions.
Fix a broken test.
Fixed two broken intentions.
Fixed some basic test cases in error intention
Rebuilt the CheckErrorIntention
Fixed all the convert statement to if intentions
Mark two tests as failing.
Remove error message that couldn't be displayed anyway