1. reduce expansion of exclusion regions
2. expand extrusion calib regions to let them touch bed boundary, to
greately simplify auto-arranging with avoidance option on
3. improve dist_for_BOTTOM_LEFT to allow objects be put left to
exclusion regions temporarily
4. improve on_preload for better handling objects around exclusion regions.
5. improve debug tools
6. fix a bug with wipe tower estimation (don't estimate if wipe tower is
explicitly disabled)
7. use larger y-overlap threshold to estimate rod height confliction
better in per-object print ordering (now we use half the clearance
radius)
Change-Id: Iab29d47a072d8515f28a09855432f92fcffa8c5f
(cherry picked from commit 3a4f242a3a6fd2f82dcc8306cde4d1cb107a5099)
Arthur
lane.wei