Min, max, and suggested cuts

[imbasimba]

Following https://github.com/WorldWideTelescope/toasty/pull/70

• Extracting global data min and data max values for tiled tangential image sets.
• Setting suggested cut values as the non-outliers of the top level tile
• Using the hips_data_range and hips_pixel_cut HiPS properties to set the same values on HiPS imagesets

[codecov[bot]]

Codecov Report

Merging #71 (8f029ac) into master (620b8b4) will increase coverage by 0.31%. The diff coverage is 78.01%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   73.63%   73.95%   +0.31%     
==========================================
  Files          23       23              
  Lines        3289     3352      +63     
==========================================
+ Hits         2422     2479      +57     
- Misses        867      873       +6     

Impacted Files	Coverage Δ
toasty/fits_tiler.py	47.33% <0.00%> (-1.98%)	:arrow_down:
toasty/image.py	77.94% <70.45%> (+1.21%)	:arrow_up:
toasty/builder.py	96.64% <85.71%> (+0.19%)	:arrow_up:
toasty/pyramid.py	94.85% <92.30%> (ø)
toasty/merge.py	95.39% <100.00%> (+0.90%)	:arrow_up:

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