further cleaned-up ggee/image selection logic (now the selection does not incorrectly pick up on the parent GOP selection, so that when opening subpatcher it does not show up as selected

improved ggee/image to have a default empty image and ensured that its layer ordering is preserved after loading a new image. Finally, made a check for valid images--if invalid format, the image reverts to default empty image included in the ggee.

fixed regression where empty image box appeared on gop-ed parent in incorrect locations and/or it was not supposed to show up at all. Some refinements to the path detection/removal of debug output.

fixed a number of small bugs including a segfault, inability to open local files, adapted code to reflect improved path searching, made image draw gray square when no image is available, reworked the way image allows for spilling beyond the GOP area by adding a second float flag, updated help file to reflect new features

fixed image external to conform with the new implementation of @pd_extra (and later other possible sys args) of the file path parser