Improved support for stm3220g-eval

...xM3_stm32/stm32f103ze_stm3210e-eval/core/stage_1_boot.cpp

miosix/arch/cortexM3_stm32f2/common/CMSIS/system_stm32f2xx.c

...x/arch/cortexM3_stm32f2/common/interfaces-impl/delays.cpp

...3_stm32f2/stm32f207ig_stm3220g-eval/core/stage_1_boot.cpp

...f2/stm32f207ig_stm3220g-eval/stm32_1m+128k_all_in_xram.ld

...3_stm32f2/stm32f207ig_stm3220g-eval/stm32_1m+128k_xram.ld

miosix/bootloaders/stm32/Readme.txt

miosix/bootloaders/stm32/pc_loader/CMakeLists.txt

miosix/bootloaders/stm32/pc_loader/main.cpp

miosix/bootloaders/stm32/pc_loader/pc_loader

miosix/bootloaders/stm32/pc_loader/serialstream.cpp

miosix/bootloaders/stm32/pc_loader/serialstream.h

.../bootloaders/stm32/uc_loader_stm3210e-eval/bootloader.bin

.../bootloaders/stm32/uc_loader_stm3210e-eval/bootloader.hex

.../bootloaders/stm32/uc_loader_stm3220g-eval/bootloader.bin

.../bootloaders/stm32/uc_loader_stm3220g-eval/bootloader.hex

miosix/bootloaders/stm3210e-eval/pc_loader/pc_loader

miosix/config/Makefile.inc

miosix/doc/textdoc/Changelog.txt

miosix_np_2/nbproject/configurations.xml