add optional args to compound obs

[danjampro]

• Allow overriding min_nexp and exp_set_size
• Use directory from parent field and subdirectories from subfields

[codecov[bot]]

Codecov Report

Merging #410 (cd20508) into develop (b44ebf3) will increase coverage by 0.06%. The diff coverage is 88.88%.

@@             Coverage Diff             @@
##           develop     #410      +/-   ##
===========================================
+ Coverage    55.34%   55.41%   +0.06%     
===========================================
  Files           62       62              
  Lines         3733     3741       +8     
  Branches       386      386              
===========================================
+ Hits          2066     2073       +7     
- Misses        1582     1583       +1     
  Partials        85       85              

Impacted Files	Coverage Δ
src/huntsman/pocs/scheduler/observation/base.py	74.19% <80.00%> (-0.31%)	:arrow_down:
src/huntsman/pocs/scheduler/observation/dark.py	86.66% <100.00%> (+2.79%)	:arrow_up:
src/huntsman/pocs/scheduler/observation/flat.py	100.00% <100.00%> (ø)

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