[dev] Run head and an older version on the same machine.

[eculp@encontacto.net]

I know this is probably possible but I can't think of a way to have two 
frameworks installed without conflict between themselves and pear.   I 
want to change folks who are using a 6-8 month old cvs installation to 
today's head version on the same machine, little by little.  I have no 
idea how to differentiate and without loosing system pear.  I'm not 
even sure it is possible.

Thanks for any suggestions.

ed