Memory Shortage Check Review.

Fix:
Issue #78 reported by @cdrfun the memory shortage calculation (that was also review) did cause the camera to stop as per the level was set to Error, instead now it is set to Warning and also instead to count 12 arrays we are now counting the one necessary for the the next step only 2. This reduce the margin to the real need memory space.
I take also this occasion to tanks you all for your kind and rightly raised issues, this is helping us to fasten and make robust the code of this project. The patches released in this days are mainly addressing those issues, and we are trying to do our best to keep all in track also, the development of the V1.5.8 that soon should be out with some improvements (the round versions are fully tested).

Thanks once again for the cooperation and understanding.