Most of the time, there is no return value from the functions,
sometimes $retval is not evaluated, and sometimes it just seems
totally convoluted to do it when 99% of the configuration code
does not do it and works fine wihout it.
It's also not practical, because there is no no notion of a
rollback that would have to ensue in such cases.
These changes create instability on development images in
conjunctio with mount for core.git: since files move they
exist in two places at once, maybe screwing up the system.
There's no sensible way other than asking for or building
a new snapshot package for opnsensense and going from there.
Make "src" the implicit "/usr/local" so that nobody can
sneak in weird files in the base file system or potentially
overwrite them.
This is the last time, I swear... :)
