Fix a number of top level doxygen issues.

So that the navigation pane works correctly in browsers.
Some additional doc fixes put in where found (but many more still to go).
Added some dummy .c and .h files to bring the associated docs into line.
makefile changed to allow 'make html' as well as 'make doc' (the latter only does html anyway).

lib/stm32/common/rcc_common_all.c

@@ -17,6 +17,7 @@
  * You should have received a copy of the GNU Lesser General Public License
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
+/**@{*/
 
 #include <libopencm3/stm32/rcc.h>
 
@@ -181,6 +182,7 @@ void rcc_periph_reset_release(enum rcc_periph_rst rst)
 {
 	_RCC_REG(rst) &= ~_RCC_BIT(rst);
 }
+/**@}*/
 
 #undef _RCC_REG
 #undef _RCC_BIT