Some new classes

[Dan Sugalski]

I just checked in stub code for the PMCArray and StringArray classes. 
Ultimately they should be auto-resizeable, PMC or String only arrays, 
though right now they aren't. (They wrap PerlArray right now, so 
they're far from efficient, but at least they're in to be used) 
Integer and Float arrays should probably go in, and we should add in 
the non-auto-resizing versions as well.

Abusing these so they aren't just virtual wrappers, and are actually 
efficient (as they can all be done as a plain C array of pointers or 
values--they don't have to be, and probably shouldn't be, sparse) 
would certainly be a Good Thing.
--
                                        Dan

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Dan Sugalski                          even samurai
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