More intelligent sampler settings

[mileslucas]

This adds some sampler changes

New Sampler Settings

• default enlarge 1.2 -> 1.25
• add proposal=:auto to choose proposal scheme automatically. If ndims <10 choose Uniform, otherwise choose rwalk
• add update_interval automatic defaults based on proposal scheme
• add min_ncall and min_eff to allow constraining when the first update occurs. Before this all sampling will be unbounded and uniform, which assists in avoiding over-fitting the bound, especially for MultiEllipsoid

This has already shown beneficial, fixing the testing issues for RWalk, and follows a lot of the rules of thumb and defaults from dynesty, which are well-founded.

[codecov[bot]]

Codecov Report

Merging #35 into master will increase coverage by 2.74%. The diff coverage is 91.48%.

@@            Coverage Diff             @@
##           master      #35      +/-   ##
==========================================
+ Coverage   83.10%   85.84%   +2.74%     
==========================================
  Files           9        9              
  Lines         290      318      +28     
==========================================
+ Hits          241      273      +32     
+ Misses         49       45       -4     

Impacted Files	Coverage Δ
src/bounds/ellipsoid.jl	84.61% <ø> (ø)
src/proposals/Proposals.jl	86.66% <88.88%> (-1.43%)	:arrow_down:
src/interface.jl	95.29% <89.28%> (-3.20%)	:arrow_down:
src/bounds/Bounds.jl	91.66% <100.00%> (+3.66%)	:arrow_up:
src/staticsampler.jl	80.00% <100.00%> (+46.66%)	:arrow_up:

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