Multiple bulks

[phoebe-p]

• Add ability to use pre-calculated TMM lookup tables directly in ray-tracing (as opposed to the currently-implemented functionality, which allows this only for a single surface in combination with the angular redistribution matrix method)
• Make automatic calculation of x and y limits for ray-tracing more robust
• Add functions for generating a roughened planar surface, and a surface with hemispherical caps
• Remove random_pyramids function based on scan data
• Change behaviour in single_ray_stack so that the ray position is randomised to strike somewhere inside the unit cell, even if the surface is not periodic (periodic = False in options)
• Add ability to calculate surface absorption to non-periodic structures
• Fix issue in tmm_structure.calculate where unphysical values for A_per_layer were calculated (datatype error in numpy array)?
• Fix test comparing periodic and non-periodic ray-tracing

[phoebe-p]

TODO before merging:

• [x] Add tests for new code

[codecov[bot]]

Codecov Report

Merging #55 (aaf5913) into devel (1a4b555) will increase coverage by 0.78%. The diff coverage is 91.45%.

:exclamation: Current head aaf5913 differs from pull request most recent head e6a1e2c. Consider uploading reports for the commit e6a1e2c to get more accurate results

@@            Coverage Diff             @@
##            devel      #55      +/-   ##
==========================================
+ Coverage   91.44%   92.23%   +0.78%     
==========================================
  Files          20       20              
  Lines        2549     2885     +336     
==========================================
+ Hits         2331     2661     +330     
- Misses        218      224       +6     

Impacted Files	Coverage Δ
rayflare/angles.py	49.18% <45.45%> (-1.70%)	:arrow_down:
rayflare/structure.py	87.50% <50.00%> (ø)
rayflare/analytic/diffraction.py	65.07% <61.11%> (ø)
rayflare/rigorous_coupled_wave_analysis/rcwa.py	84.77% <81.77%> (+0.18%)	:arrow_up:
rayflare/utilities.py	93.42% <92.91%> (-0.52%)	:arrow_down:
rayflare/textures/standard_rt_textures.py	96.57% <93.52%> (+3.24%)	:arrow_up:
rayflare/ray_tracing/rt.py	95.57% <94.96%> (+0.45%)	:arrow_up:
rayflare/matrix_formalism/multiply_matrices.py	97.11% <96.07%> (-0.22%)	:arrow_down:
rayflare/transfer_matrix_method/tmm.py	99.01% <98.01%> (+0.02%)	:arrow_up:
rayflare/matrix_formalism/__init__.py	100.00% <100.00%> (ø)
... and 8 more

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