[patch] Fix doxygen warnings

[Jonathan Wakely]

Ensure parameter names and doxygen comments match, document missing
parameters, fix markup etc.

Tested x86_64-linux, committed to trunk.

The C++14 headers added to the .cfg file won't produce any output
until we bump the value of __cplusplus Doxygen uses. I suppose we
should really document classes and functions to say if they're only
available since C++11 or C++14, but can anyone think of any other
reason not to default to generating docs for C++14?
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