a fix for Bug ID 705243 (read_graphviz)

[nobody]

When I tried to fix the bug 705243, I found the
directory libs/graph/src in the CVS repositry was
cluttered with redundant sources. The attached zip
archive includes proposed contents of this directory.
Removing unnecessary files, I fixed the bug in
graphviz_parser.yy and reproduced the C++ source files.
Makefile, Jamfile and graphviz_lex.ll had to be fixed
to build the new contents. Note that bison newer than
the release 1.875 seems to be required to build properly.

[Vladimir Prus]

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With your new Makefile and Jamfile, I can build with both make and 
Boost.Build v1 -- neither of which seem to work at the moment. I'd be 
happy to commit the change -- but I'd appreciate if you give your name so 
that I can acknowlege the contribution. 
It seems like graphviz_parser.yy is a separarate bugfix. Would you mind 
sending a unified diff together with proposed log message to the mailing. 
Thanks. 

[Vladimir Prus]

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user_id=321498

Comitted all the changes. The Makefile fix is almost merged to 
RC_1_31_0, other changes are on trunk only.