nana/gdb - some gdb commands and patches for various obscure purposes.

quiet.diff - patch for 4.16 which adds a --quiet-breakpoints option
	which stops all those "Breakpoint set at " messages which be
	can be a bit tiresome if your setting a large number of breakpoints.
	(-silent, -quiet and -batch don't seem to stop this).

nana-trace - produce a line by line trace of the execution of a program.
nana-trace-calls - produce function call trace of the execution of a program.
nana-coverage - produce a code coverage list (code vs # of times executed)
nana-coverage-calls - as nana-coverage except on a per call basis

WARNING: this code seems to be causing gdb 4.16 a few headaches, I've
  probably got a few bug reports to fill out before this stuff works.

