mega-patch

I have just made a change to allow configure to properly find tcl/tk. 
The old code never found tk.h if it existed in /usr/include, and their
were other problems.

I also removed the version-specific stuff from tcl/tk searching, so they
will have to be called tcl.h/tcl.[a/so] and tk.h/tk.[a/so] without the
version numbers. You will also have to specify the search location for
those directories when prompted by configure.

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