Log Message:
Release 0.3.1

Lensfun 0.3.1 maintenance release is out with more than 60 new lens profiles and \ 
another 30 updated calibrations.

Other changes:

Improved performance when used with 32-bit float image buffers
Introduced automated testing
lensfun-update-data now also works without root privileges
Fixed autoscaling for panoramic and equirectangular projections