Add JuMP-like API

[joaquimg]

closes #271

• remove slack data from conic model. close Remove slack data from conic model #296
• improve parameters check OR allow mixing parameters and function (when setting sensibs)
• fix constraint names on copy to diff (see test/jump_wrapper.jl)
• cleanup support for constrained variables
• cleanup error messages from parameters.jl close Cleanup error messages from parameters.jl #300

[codecov]

Codecov Report

❌ Patch coverage is 92.06349% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.01%. Comparing base (2d346bb) to head (3d9ca1f).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/diff_opt.jl	81.81%	4 Missing ⚠️
src/moi_wrapper.jl	92.59%	4 Missing ⚠️
src/ConicProgram/ConicProgram.jl	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #281      +/-   ##
==========================================
- Coverage   89.20%   89.01%   -0.20%     
==========================================
  Files          15       16       +1     
  Lines        1973     2057      +84     
==========================================
+ Hits         1760     1831      +71     
- Misses        213      226      +13     

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[joaquimg]

@andrewrosemberg , this way of getting the map does not seem to match perfectly with the one below

[andrewrosemberg]

My logic was:

• dual_Δs is indexed by NLP model constraint index, so we need to go from MOI to NLP using dual_mapping
• In the one below Δp is indexed my NLP Parameter index, so we need to go from MOI variable index to NLP parameter index, thus the use of var2param