To Do

IMPORTANT dimensional compression and PC_Uncompress probably don't play will together... once serialized, patches don't know their compression anymore, so it's possible to pass a NONE patch up into deserialize and have it treated as a DIMENSIONAL
(?) convert PCBYTES to use PCDIMENSION* instead of holding all values as dupes
(??) convert PCBYTES handling to pass-by-reference instead of pass-by-value
implement PC_PatchAvg/PC_PatchMin/PC_PatchMax as C functions against patches with dimensional and uncompressed implementations
update pc_patch_from_patchlist to merge dimensional patchlists directly
TESTS for pc_patch_dimensional_from_uncompressed() and pc_patch_dimensional_compress()
Add Min/Max values to dimensional compression serialization (???)
Before doing dimensional compression, sort by geohash (actually by a localized geohash based on the patch bounds). This will enhance the autocorrelation of values and improve run-length encoding in particular
Add Min/Max values to front of GHT serialization

Use Cases to Support

frustrum filtering
raster overlaying
filtering on attribute values
filtering on spatial polygons (in and out)
find the k nearest points to point P
gridding/binning ("avg intensity per cell", "max z per cell", "agv red per cell", "rgb into grid/picture")
reprojection / re-schema