Support NSIDE greater than 8192

[ziotom78]

• Increment test accuracy from 1e-10 to 1e-12
• Alter NSIDE_MAX so that it adapts to the machine's architecture
• Reformat a few tables to make the code more readable
• Make ang2pixNest robust even for NSIDE>8192
• Change the tests for too large NSIDE values
• Reimplement pix→ang and ang→pix functions to support NSIDE>8192
• Update the documentation for NSIDE_MAX

[codecov[bot]]

Codecov Report

Merging #75 (01d82e1) into master (5b716f5) will decrease coverage by 1.79%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
- Coverage   86.66%   84.87%   -1.80%     
==========================================
  Files          18       18              
  Lines         990      952      -38     
==========================================
- Hits          858      808      -50     
- Misses        132      144      +12     

Impacted Files	Coverage Δ
src/nside.jl	100.00% <ø> (ø)
src/xyf.jl	92.06% <ø> (ø)
src/pixelfunc.jl	83.61% <100.00%> (-8.48%)	:arrow_down:

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