pipicfile.c first working version

pipicfile prints register contents and file addresses from PiPIC. See the
manual page for details.
pipicfile.c new -e option to read EEPROM content.

Start using hexadecimal input parameters instead of decimals.
Clean up pipic.c and pipicfile.c.

Now address and command bytes are given as hexadecimal numbers.

Update manual pages.

Print ascii characters from EEPROM.