[mod_python] Embedded python support

Hi,

Before mod_snake was killed, I quite liked its embedded python support.
As mod_snake is now dead, I've ported their epy modules to mod_python
and made them available. For those of you who aren't familiar with the
epy feature, it allows you to embed fragments of python into html code,
in the same way VBScript and JScript can be done in ASP, Java in JSP,
PHP in PHP (??), etc.