In developer mode, use internal documentation as well.
This should produce no warnings. Fix yours!

In noisy mode, output all possible warnings of Doxygen.
This creates zillion of warnings. Double-check your current module!

Any warnings are in the file './doxygen.log'. Beside that, this change
avoids deprecated parameters because the configuration file for Doxygen
contains only those parameters which differ from the default. This
avoids the need to update the file on each run. Furthermore, it adds
AST_VECTOR to be expanded. Finally, the default name for that file is
Doxyfile. Therefore, let us use that!

ASTERISK-26991
ASTERISK-20259

Change-Id: I4129092a199d5e24c319a09cd088614b121015af