[BBv2 design issue] stage.jam has to be patched when a new toolset is added

From: Andrey Melnikov (melnikov_at_[hidden])
Date: 2005-07-08 12:51:52

I'm creating a toolset for Amd 64 bit compiler shipped with last MS 
PSDK. I'm not fluent in BBv2 internals, so I decided just to patch a 
copy of MSVC toolset.

I had to add a line to stage.rename rule so toolset-tag is created for 
my x64.jam toolset. I think it isn't good, and this tag should be 
provided by toolset itself.

Andrey