TkAgg backend issues

JDH... do you have any idea where to put it?

I created a dir in CVS "license" which contains

LICENSE - the matplotlib license

LICENSE_PAINT - not really required anymore since font.cpp is no
  longer used

LICENSE_PIL - you can refer to this in the appropriate tkagg src

I also made a committed of couple of minor changes earlier to the
tkagg src that Andrew suggested to me that enable it to build cleanly
on OS X. With the current CVS and, I can build
all the backends on linux, win32 and darwin, which is *a good thing*