See also: #1069

Fix imp.load_module if the module already exists and ban creating instances of None type

Fix long(None) and 	bug inside getattrEntry() which made test_decimal fail

The cpython decimal test triggered this bug and works now. (But I had to add the correct version of the test)

Two minor problem which found in NumPy tests

Fix minor compatibility issues

add support for avro

enable PyStringObject and remove some workarounds inside the numpy patch

@rudi-c #1027 numpy patch with a small fix

By checking for the error state before the chosen CF call, we
know that it's not the CF call that set the error state.

Allow widths represented by subclasses of int and throw an exception
instead of aborting if the wrong types are given.

Also some minor cleanup of the NumPy test script.

Some of the patches are no longer necessary, as issues have
been fixed.

Use our interned ints more often (especially for constants specified inside the source)

Before we did not use the interned ints for constants inside the source code
so every module had there on 0, 1 etc...

switch to CPython parser

compile: Don't check for ''break' outside loop' error when in AST only mode