Allow aftyer import Cull process to read either from embedded or calculated previews

With the new CULL tool, it is nearly impossible for wildlife photographers to assess the sharpness of birds in flight taken with small sensor “sports” cameras. When culling AFTER having imported pictures, allow the user to select EITHER “embedded preview” OR “calculated preview” mode, irrelevant of the performance. This will greatly help selecting the “sharpest” picture in a group of identical pictures.

Also, when culling AFTER Import, allow the Cull tool to only take into consideration filtered images, instead of entirely reading the selected Album/folder to calculate the groups. This will increase the correctness of the groups, like when two/more photographers take different pictures at the same time. Groups are calculated so that first photog pictures may be "wrongly" split into two/more groups because second photographer pictures interspersed with first photog pictures. Selecting pictures from ONE photog will eliminate that problem.

Allow the C1P to cull with the standard browser mode for the “Loupe” tool, that is allow the shortcuts for “Customize Viewer Zoom” in, Out, 100,200,400% etc. as well as the mouse “right click” to select a zone to display/move around.