This enables the new quell terminal command to switch on and off progress reports to the terminal. The code for this was moved from main.c to term.c. It can be used as library call for other frontends than main.c
Use enums for write mode, and change datatypes from int/long/char to int32_t/uint8_t where possible
Syntax: write <memtype> <start addr> <no. byte to write> <byte to write> ...