[z3-five] five:localsite zcml conflicts w/ Five 1.4

[Rob Miller]

hi there,

i'm using the Five 1.4 branch w/ Zope 2.9 branch, and am having problems b/c 
multiple products want the same classes to be declared as possible local 
sites.  using the <five:localsite> tag in multiple places for the same class 
will cause a ZCML conflict error.  even using overrides.zcml just buys you one 
more location you can declare it.

is there a safe way to do this with ZCML?  the only way i can think of to work 
around this for now is to put some code in my package initialization routine 
that will inspect the classes and then call zcml.load_string with the 
five:localsite tag if necessary.  is there no better way?

-r