[IronPython] Some patches

[Christopher Baus]

> patch-ironpython-base64-slash
> This patch fixes an issue that strings with slashes are incorrectly
> decoded by base64 module.
>
> patch-ironpython-re-lastgroup
> This patch implements lastgroup attribute of match objects produced by
> regular expression matching.
>
> patch-stdlib-logging-getframe
> This patch prevents sys._getframe() from being called in logging
> because it's not implemented on IronPython.
>
> I will submit the last one to CPython.
> I will create a new release of the community edition with above patches
> ASAP.
>

Wow, great work.  Maybe I shouldn't give up yet.