Add get_bounds to Utilities

[joehuchette]

Computes variable lower/upper bounds set on a MOI variable

[odow]

It's valid to have separate lessthan AND greaterthan constraints. It's not an OR.

[codecov-io]

Codecov Report

Merging #890 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #890      +/-   ##
==========================================
+ Coverage    95.1%   95.16%   +0.06%     
==========================================
  Files          80       81       +1     
  Lines        8481     9332     +851     
==========================================
+ Hits         8066     8881     +815     
- Misses        415      451      +36

Impacted Files	Coverage Δ
src/Utilities/Utilities.jl	100% <ø> (ø)	⬆️
src/Utilities/variables.jl	100% <100%> (ø)
src/Bridges/Constraint/scalarize.jl	77.55% <0%> (-2.45%)	⬇️
src/Utilities/model.jl	94.64% <0%> (-0.26%)	⬇️
src/Test/UnitTests/solve.jl	100% <0%> (ø)	⬆️
src/Utilities/copy.jl	94.66% <0%> (+0.02%)	⬆️
src/Utilities/functions.jl	94.06% <0%> (+0.05%)	⬆️
src/Bridges/bridge_optimizer.jl	95.75% <0%> (+0.15%)	⬆️
src/Test/modellike.jl	99.27% <0%> (+0.21%)	⬆️
... and 5 more

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[blegat]

What about MOI.EqualTo, if it's set we could return both bounds equal to the value of the set.

[joehuchette]

But it's invalid to have an Interval AND a GreaterThan, correct?

[odow]

But it's invalid to have an Interval AND a GreaterThan, correct?

Yes. Here are the options:

• Interval
• LessThan
• GreaterThan
• EqualTo
• LessThan AND GreaterThan
• Semicontinuous
• Semiinteger