Renewed resolver, closes PY-19 and supposedly PY-13.

Introduces a new internal interface for easier resolution.
       Corrects fromQualifiedPackageImportFile and LookAhead tests.
       There is a known problem with Jython resolution using "import *", to be fixed later.

python/testData/resolve/LookAhead.py

@@ -1,5 +1,4 @@
-g<ref>gg("q")
+def f():
+  return f<ref>oo
 
-def f(q): pass
-
-ggg = f
+foo = 1