Fix formatting of non-request frames
Improved diagnostic for cases where firmware is not loaded
Increase master reboot timeout to avoid errors leaving bootloader mode
top-level flash-everything target
Fix load/save parameter filename arg indexes
print correct filename when linking
Switch from Jzon to SuperSimpleJSON, load/save is working now

Note that this does not produce pretty-printed JSON, and the parser
chokes on pretty-printed JSON making life hard for anyone that wants to
edit the save files, but it serves the immediate purpose of parameter
save/restore around firmware updates.

Fixes #62