Remove superflous write to NVMC register in pinreset.
Clean up comments regarding softdevice flash and erase all.
Make startdebug run the GDB server and gdb itself in separate terminals.
Run gdb in same terminal.
Finish removal of stopdebug.
Revert "Run gdb in same terminal."

This reverts commit c385005ce31dfa8f503948b833aebd97cc49b4f7.