This is the first step in refactoring regrtest to use argparse.  The
regrtest module's main() function still expects a getopt-style return
value rather than an argparse.Namespace instance.

When converting REG_DWORD registry values into Python ints, the conversion
needs to be made from an *unsigned* long to match the DWORD type.

Patch by Roger Serwy.

Patch by Roger Serwy.

Patch by Roger Serwy.

This fixes an OverflowError seen in winreg.SetValueEx when passed
winreg.REG_DWORD values that should be supported by the underlying API.

Fixes handling of leading dots.

Patch by Serhiy Storchaka.

Fixes handling of leading dots.

Patch by Serhiy Storchaka.

Fixes handling of leading dots.

Patch by Serhiy Storchaka.