heads up: no more \brief in libosmocore

I've just merged a patch that enables the AUTOBRIEF function of doxygen, in libosmocore. Every API doc's first sentence up to the first full-stop '.' is now automatically its \brief description. You may omit the \brief. This is so far only in libosmocore, since I'm not aware of us generating doxygen in any other repositories. Either way we can and should avoid the \brief, and in doubt enable the AUTOBRIEF everywhere. I've also shifted around the \file directives across libosmocore, and wrote a wiki page that describes it among other things: https://osmocom.org/projects/cellular-infrastructure/wiki/Guidelines_for_AP… Related: the series of "doxygen:" commits that just came into libosmocore master. http://git.osmocom.org/libosmocore/commit/?id=87e4550585c643e97e0003119b254… http://git.osmocom.org/libosmocore/commit/?id=17518fe393a37781c84d09836256b… Do any other code trees need this switching? ~N