Hi,
libloc and libloc-database are now in Debian unstable should transition to Debian testing in the next 5 days. One nitpick is that it does not build an all platforms:
https://buildd.debian.org/status/package.php?p=libloc
Not really important but maybe worth to look into for bugs in the code. You can try to reproduce the failing tests with these images:
https://people.debian.org/~gio/dqib/
Otherwise I could test on real hardware.
Cheers Jochen