Allow to write to ram and start loaded programs. 

that case. Report advance in half-word writing. Setting stack and PC give
access error so automatic start fails too and hardware needs to be hard-reset
to start

by consecutive page erase
Allow to erase the device with the flash

SP value and the Program counter with the reset value from the Vector
table. Then run reset function

behaviour with L1 and F2

Conflicts:
	gdbserver/Makefile

As write_buffer_to_sram() can now handles arbitrary size, use flash_pgsz chunks for writing F1 and reduce output

moved the device parameter loading at the end of initialization for V1 devices- fixed the problem of non working V1 devices

STM32L from programming

Page erase for STM32L needs a real write to lowest address with 0. stink_write_mem(.., ..,0) is undedined

This batch implements and exposes the single data word access, jJTAG NRST and makes the F107 work when in Sleep mode. 

Use the single word accesses in the flash inner loop too. We first swap the data, then the access routine swaps the data again, but cycles are cheep and so don't need another access function

stlink_reset(). Otherwise a sleeping device (WFI) doesn't return the
parameters.