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/stm32/f2/crc.c

@@ -4,6 +4,11 @@
 
 @brief <b>libopencm3 STM32F2xx CRC</b>
 
+@version 1.0.0
+
+@date 15 October 2012
+
+LGPL License Terms @ref lgpl_license
 */
 
 /*

lib/stm32/f2/dac.c

@@ -4,6 +4,11 @@
 
 @brief <b>libopencm3 STM32F2xx DAC</b>
 
+@version 1.0.0
+
+@date 18 August 2012
+
+LGPL License Terms @ref lgpl_license
 */
 
 /*

lib/stm32/f2/dma.c

@@ -4,6 +4,11 @@
 
 @brief <b>libopencm3 STM32F2xx DMA</b>
 
+@version 1.0.0
+
+@date 30 November 2012
+
+LGPL License Terms @ref lgpl_license
 */
 
 /*

lib/stm32/f2/gpio.c

@@ -4,6 +4,11 @@
 
 @brief <b>libopencm3 STM32F2xx General Purpose I/O</b>
 
+@version 1.0.0
+
+@date 18 August 2012
+
+LGPL License Terms @ref lgpl_license
 */
 
 /*

lib/stm32/f2/i2c.c

@@ -4,6 +4,11 @@
 
 @brief <b>libopencm3 STM32F2xx I2C</b>
 
+@version 1.0.0
+
+@date 15 October 2012
+
+LGPL License Terms @ref lgpl_license
 */
 
 /*

lib/stm32/f2/iwdg.c

@@ -4,6 +4,11 @@
 
 @brief <b>libopencm3 STM32F2xx Independent Watchdog Timer</b>
 
+@version 1.0.0
+
+@date 18 August 2012
+
+LGPL License Terms @ref lgpl_license
 */
 
 /*

lib/stm32/f2/rtc.c

@@ -4,6 +4,11 @@
 
 @brief <b>libopencm3 STM32F2xx RTC</b>
 
+@version 1.0.0
+
+@date 4 March 2013
+
+LGPL License Terms @ref lgpl_license
 */
 
 /*

lib/stm32/f2/spi.c

@@ -4,6 +4,11 @@
 
 @brief <b>libopencm3 STM32F2xx SPI</b>
 
+@version 1.0.0
+
+@date 15 October 2012
+
+LGPL License Terms @ref lgpl_license
 */
 
 /*

lib/stm32/f2/usart.c

@@ -4,6 +4,11 @@
 
 @brief <b>libopencm3 STM32F2xx USART</b>
 
+@version 1.0.0
+
+@date 30 August 2012
+
+LGPL License Terms @ref lgpl_license
 */
 
 /*