Deprecate: deprecate remaining functions of Fitrecipe

[cadenmyers13]

These are,

boundsToRestraints
getBounds
getBounds2
getNames
getValues
isFree

Additionally, added a test for boundsToRestraints. No tests exists for getBounds and getBound2. When i tried writing a test for them, it seemed that the function is broken. I didnt investigate deeply but i opened an issue. I also improved some docstrings :)

[cadenmyers13]

the mentioned issue is here #158

[cadenmyers13]

@sbillinge ready for review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.30%. Comparing base (644cc97) to head (526034d).
⚠️ Report is 15 commits behind head on v3.3.0.

Additional details and impacted files

@@            Coverage Diff             @@
##           v3.3.0     #159      +/-   ##
==========================================
+ Coverage   71.06%   71.30%   +0.23%     
==========================================
  Files          25       25              
  Lines        3660     3690      +30     
==========================================
+ Hits         2601     2631      +30     
  Misses       1059     1059              

Files with missing lines	Coverage Δ
tests/test_fitrecipe.py	99.82% <100.00%> (+<0.01%)	⬆️

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[cadenmyers13]

@sbillinge oops this was failing because a typo. its passing now