fixed a bug in bin getting
- removed the HwRoi setting at Init (this cam model seems to not support Hw Roi)
- fixed a bug in bin getting
- minor
- added driver doc for perkin elmer
Clean up for better documentation
- added an env variable as path for includes and lib: XIS_ROOT
Merge git://github.com/esrf-bliss/Lima-camera-perkinelmer

* git://github.com/esrf-bliss/Lima-camera-perkinelmer:
  - added an env variable as path for includes and lib: XIS_ROOT
  Clean up for better documentation
  - added driver doc for perkin elmer
  - minor
  - removed the HwRoi setting at Init (this cam model seems to not support Hw Roi) - fixed a bug in bin getting
  fixed a bug in bin getting