Deleted using deprecated typedef prog_char.
Added const specificator for variables with progmem attribute.
Added const specificator for variables with progmem attribute.
Removed deprecated macros SIG_x.
Deleted type convert warnings.
Fixed comment.
Removed deprecated macros SIG_x for AVR_ATmega128.
Removed deprecated macros SIG_ADC.
Added const specificator for variables with progmem attribute.
Removed deprecated macros SIG_x.
Removed deprecated macros SIG_x.
Commented extintConfigure function body, because this function doesn't
work right for AVR_ATMega128.
Changed wrong ext int mask register name.
Removed deprecated macros SIG_2WIRE_SERIAL.
Removed deprecated macros SIG_SPI.
Edited README.md file.