lua usermanual : rework function synopsis to be more docbook friendly
usermanual: add missing hint in exposure module
Italian translation updated
Merge pull request #590 from bartokk/master

Italian translation updated
IOP Lens: modify_roi_in: use local buffers
IOP Lens: process: constify & others
IOP Lens: process (distort): use local buffers
IOP Lens: process (correct): use local buffers
IOP Lens: drop local buffers