Fixed dma interrupt flag related definitions.
Synchronise linker scripts which are supposed to be identical

This also report bug fixes about data alignment and bss storage to EFM32 &
LM3S targets.

Note: removed chrysn copyright statement as the file is a verbatim copy of
previous files.
Add support for static constructors and destructors
Small improvements of using FLASH memory in STM32F1XX
Remove redundant access size argument in F4 flash code.
Change the way buffer for control requests data is allocated

Current way of having a globally, but weakly defined static buffer has
several shortcomings:
 - It forces user to have a certain "magic" byte array variable if
   they want to have a control buffer of different size.
 - Having a globally defined static array and a separate function to
   tell USB core about its size is error prone.
 - Its inner workings are not easily understandable form cursory look
   at API and one needs to go and look at the implementation code to
   connect all the pieces into a solid picture of how it works

This commit adds two parameters to 'usbd_init' call that allow user to
specify the pointer to the area of memory and a size of that memory
which would be used by the USB core to store the data received during
DATA stage of control requests. This approach, while further
complicating the prototype of 'usbd_init', provides user with more
flexibility allowing for any custom area of memory of any size to be
used as control buffer. It also forces user to provide both address
and memory size at the same time thus avoiding the possibility of user
redefining 'usbd_control_buffer', but not calling
'usbd_set_control_buffer_size' after that.
As requested (6 Feb 2013) change DMA interrupt flag names
in STM32/common, for dma_common_f24, to match those used in dma_common_f13.
Examples compile OK
STM32: moved timer_ic_set_polarity from timer_common_all to
f1/timer.
Added timer_ic_set_polarity to timer_common_f24 with
the enum tim_ic_pol now including trigger on both edges.
Changed timer_slave_set_polarity to use enum tim_et_pol
rather than tim_ic_pol.

In response to suggestion of stinkydiver73 on 24 March that
timers in all families have an option for triggers on both
edges, except F1.
[stm32] usart6 for F2/F4