cgana: bugfix, skip_Tuple
rta: improved

[r3133]

[r3130]

[r3124]

small functions that should be inlined in libFirm are implemented in _t.h files
with a __ prefix.
Preprocessor magic is used to automatically inline these functions whenever a _t.h
file is included instead of a .h file.
Note that this magic did not work outside libFirm without accessing _t.h files.

[r3085]

[r3073]

[r3066]

[r3065]

[r3062]

[r3058]

[r3057]