Move code from CWEB to pure C. Literate Programming is not for me.
* bprocessor.c: Use 24 MHz system clock.
* lcd.h, lcd.c: Function for displaying HEX symbols.
* onewire.c (OW_DIR_OUT, OW_DIR_IN): Write directly to port, not through libopencm3 API functions.
* onewire.c (ow_bit_io): Fix timings for writing bit 1.
* sysclock.c (systick_init): Fix reload value to work with PLL 24MHz clock, instead of HSI.