Support GCPGeoBoxes with few points only

[Kirill888]

GCP

When fitting polynomial use lower rank if only few points available.

Closes #67

New features

• BoundingBox.boundary() generate points along the perimiter
• {BoundingBox|GeoBox}.qr2sample quasi-random 2d sampling using R2 sequence
• Geometry.assign_crs use different CRS without changing geometry itself
• Geometry.transform(..., crs=) can now optionally change CRS of the transformed geometry
• odc.geo.geom.triangulate wrapper for for shapely method
• MaybeCRS now includes special Unset case to differentiate from None
• More robust Geometry.geojson (support composite and crs=None geometries)
• rio_geobox helper method in converters

[codecov[bot]]

Codecov Report

Merging #68 (596c3ef) into develop (96e7801) will increase coverage by 0.22%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop      #68      +/-   ##
===========================================
+ Coverage    97.96%   98.18%   +0.22%     
===========================================
  Files           23       23              
  Lines         3628     3748     +120     
===========================================
+ Hits          3554     3680     +126     
+ Misses          74       68       -6     

Impacted Files	Coverage Δ
odc/geo/_version.py	100.00% <100.00%> (ø)
odc/geo/converters.py	100.00% <100.00%> (ø)
odc/geo/crs.py	100.00% <100.00%> (ø)
odc/geo/data/__init__.py	100.00% <100.00%> (ø)
odc/geo/geobox.py	98.74% <100.00%> (+0.01%)	:arrow_up:
odc/geo/geom.py	100.00% <100.00%> (ø)
odc/geo/math.py	100.00% <100.00%> (+2.41%)	:arrow_up:
odc/geo/roi.py	100.00% <100.00%> (ø)
odc/geo/types.py	99.54% <100.00%> (+<0.01%)	:arrow_up:

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