[Patch, wwwdocs+maintainer-script] Add libquadmath documentation to gcc.gnu.org/onlinedocs/

[Tobias Burnus]

The attached patches add libquadmath documentation to 
http://gcc.gnu.org/onlinedocs/

(The documentation is not fancy, but it lists the available math 
functions and gives a more detailed description of the two libquadmath 
I/O functions. Cf. 
http://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libquadmath/libquadmath.texi )

OK for committal?

Tobias
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