Fix, check in tolerant del was too strict for "--debug" mode.
Fix, the name mangling for private class attributes was not fully compatible.

* For classes with names that start with underscores, these need to be
  ignored when changing the attribute name.

* Fix for Issue#119 which finds the breakage of incompatible mangling
  of Nuitka for these cases.

* Also added test case.
Fix, lxml was not working in standalone mode.

* The import to "gzip" from "lxml.etree" is not visible and needs to
  be hardcoded as well.

* The "ascii" encoding is used and should be included as well.
Fix, was not handling all special characters that can occur in module names.

* Now encoding the module name in a safe way that should not allow
  collisions at all.

* Anything not possible in a C identifier, is now quoted.

* Fix for Issue#118.
New hotfix release.
Merge branch 'hotfix/0.5.0.1'