JuMP v1.3.1

Diff since v1.3.0

Closed issues:

• Request for the capability to obtain the start value of the NLexpressions (#3067)
• @NLconstraint names (#3069)
• unregister option in delete (#3070)
• Failure to multiply real variable with complex matrix (#3071)
• relax_integrality takes really long for large problems even if there aren't that many integer variables (#3086)
• QuadExpr in nonlinear expressions produce empty summations (#3090)

Merged pull requests:

• [docs] start a tutorial on debugging JuMP models (#3043) (@odow)
• [docs] add more examples to nlp.md (#3068) (@odow)
• Fix stability of operators with Complex args (#3072) (@odow)
• [docs] improve factory scheduling example (#3073) (@odow)
• [docs] update NLP docs and explain performance issue (#3074) (@odow)
• [docs] override style in PDF output (#3075) (@odow)
• [docs] add link to documentation PDF (#3076) (@odow)
• [docs] change Getting started with Julia to use REPL blocks (#3077) (@odow)
• [docs] lots of minor tweaks to the tutorials after reading through the PDF (#3078) (@odow)
• [docs] Fix typo (#3079) (@avixFF)
• [docs] add Vale as a documentation linter (#3080) (@odow)
• [docs] remove urban_plan.jl (#3081) (@odow)
• [docs] refactor the transportation problem tutorial (#3082) (@odow)
• [docs] fix typos in docs (#3083) (@odow)
• [docs] condense the simple nonlinear tutorials into a single page (#3084) (@odow)
• [docs] add comments and multiline strings to getting_started_with_julia (#3085) (@odow)
• Improve performance of relax_integrality (#3087) (@raphaelsaavedra)
• [docs] Tidy the min_ellipse tutorial (#3089) (@odow)
• Fix empty sums in Aff/QuadExpr parse_expression (#3091) (@odow)
• Fix method ambiguities in JuMP (#3092) (@odow)
• Prep for v1.3.1 (#3093) (@odow)