If the user has missed the step about setting up their account
with the right group membership, they would get a cryptic failure
from stty, so catch this and explain the problem.
This should never happen, but could if something goes badly wrong
in the device detection code, e.g. someone changing it in a way
which caused extra output on STDOUT.
Several people have reported difficulty flashing firmware on macOS High Sierra because the
device port filename doesn't match the serial number from system_profiler. In particular,
system_profiler would return a string ending in `E` whereas the device filename would have
a `1`. This change adds a check for that filename explictily.
I also corrected the location_id fallback (the substring should have been just 3
characters long, not 4), and it works properly on my system if I make the device shortname
7 characters long, and the filename reverts to using the location id instead.
Last, I added one more check, simply listing the filenames, and searching for a match for
the string `kbio01`, which should be present (although in one case, it wasn't).
It's easier for most people to interpret numbers in decimal than hexadecimal; adding this
option to avr-nm prints out the sizes in the size_map in a more intuitive format.
On some locales awk will generate commas instead of dots in the percentage. This will mess up the sed command. Instead of forcing awk to always generate dots we can simply cange the sed command to treat commas as regular text.
Currently, if kaleidoscope-builder fails to find a sketch file, the
resulting error message is very confusing and unhelpful. This commit
makes it more straightforward and helpful.