multi patch support for emerge

[Ralf Habacker]

Hi,

since svn revision 1161590 trunk emerge is now available to support more 
than one patch file by using the following patch definition line

self.patchToApply['build-target'] = [('filename', <patchdepth>), 
('filename', <patchdepth>)]   (with integer patchdepth)

This helps to ensure having single patch files which makes live easier 
than to maintain one big patch file.

BTW: For subclass based packages this feature is not available yet.

Regards
 Ralf