Rename all .cc/.hh to .cxx/.hxx

[Ingo Ruhnke]

As the .cc/.hh extension is causing throuble for Windows people and
makes grep'ing through all files a bit more complicated ("find . -name
"*.?xx" vs find . -name "*.cc" -o -name "*.hh") I plan to rename all
files sooner or later to .cxx/.hxx. Is there any objection to that?
And when should that be done? After release 0.5 is out or before (I
tend to do it before)?

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