Repair to documentation (most documented files)

to remove errors, duplications and inconsistencies.
File lib/stm32/f1/pwr.c - all code removed as it duplicates that in common/pwr_common.c
Remaining changes do not affect code. Compiles OK.
TODO efm32 has no code so generates no modules
TODO F2 needs pwr.c
TODO L1 needs dma.h and dma.c

lib/lm4f/rcc.c

@@ -23,6 +23,8 @@
  *
  * @ingroup LM4F
  *
+@author @htmlonly &copy; @endhtmlonly 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
+
  * \brief <b>libopencm3 LM4F Clock control API</b>
  *
  * The LM$F clock API provides functionaliity for manipulating the system clock,