Fix OOM bugs resulting from image cropping

- Image processing is single threaded
- Clean up mat's in Mapper

if globalFMThr is not explicitly set in convenience function apply, t…

…he value from FocusEstimation is the current one (default or set)

if globalFMThr is not explicitly set in convenience function apply, t…

…he value from FocusEstimation is the current one (default or set)

if globalFMThr is not explicitly set in convenience function apply, t…

…he value from FocusEstimation is the current one (default or set)

if globalFMThr is not explicitly set in convenience function apply, t…

…he value from FocusEstimation is the current one (default or set)

switching between fast and precise page segmentation (via the navigat…

…ion drawer)

removed debug output in FocusMeasure.cpp

git compatible license

git compatible license

code cleanup

reduced CPU usage

bug fixes