do not catch Failure exceptions for now (swallows all important information)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6243 f16182fa-f095-11de-8f43-4547254af6c6
detect invalid call on abstract property (fixed issue #1513)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6244 f16182fa-f095-11de-8f43-4547254af6c6