(not just to library root)

This reverts commit 90910cae.

This reverts commit 95f9bcba.

we should definitely make asserts unconditional

* drop dependency on stdlib/alt-headers in the most tests
* assign to myEnvironment at most once in JetLiteFixture
* more tests do not compile runtime

(not just to library root)

usage 'call.getCallElement' instead of 'call.getCalleeExpression' while 'invisible member' error reporting

correspondence between CallableDescriptorCollector and CallTransformer (special treatment only for function invocations)

'getNonMembersByName' instead of 'getExtensionsByName' not to throw out invocation of variables with members-extensions

changed CallTransformer responsible for resolving second call ('invoke') for 'variable as function' case