libmysqlclient16-dev deleted from Ubuntu 12.04 repository, is it possible to use libmysqlclient-dev instead of libmysqlclient16-dev or not?!! And all the features of libmysqlclient16-dev are in libmysqlclient-dev or not?!
Yes, they are.
It should generally be possible to do that, unless your source has a hard-coded dependency upon libmysqlclient16-dev.