3.0.2

Update 3.0.2:

• bumped version (to major version 3 for VC3D)
• includes various fixes & improvements as documented in the FASP thread
• enabled 16bit support display for viewer
• additional input data sanity check for vc_tiffxyz_upscale_grounding
• added vc_seg_add_overlap, usage:

     vc_seg_add_overlap <tgt-dir> <single-tiffxyz>
         this will check for overlap between any tiffxyz in target dir and <single-tiffxyz> and add overlap metadata

(expect this to crop up in @bruniss workflow guides.)