add multibox output to inception_and_threshold

[greenLeopard]

def post_filter & def detect require modifications.

replace maxFireSegment (dict) with fireSegments (list of dicts) with info on all segments above threshold
add a loop around the code that generates annotated segments

add setting in inception_and_threshold to select max box or all boxes above some threshold.

definition of done:
images send in output notifications can have a single box (max) or can have several highlight boxes (pr > threshold)