v3.7.0

ModelingToolkit v3.7.0

Diff since v3.6.4

Closed issues:

• Operation times a sparse array errors (#381)
• Symbolic derivation of Jacobian no longer working (#403)
• MTK generated function printing out a lot of messages (#406)
• Arrays of sparse matrices not sparse (#407)
• Unit tests for arrays of matrices not hooked up (#408)
• Converting Derivative to Variable does not depend on type of Derivative (#409)
• make_sub! in ReactionSystem -> NonlinearSystem should be substitute (#418)

Merged pull requests:

• Fix type of mass matrix to be based on u0 (#397) (@ChrisRackauckas)
• provide iszero for Operation to help sparse matrix addition and multiplication (#404) (@caryan)
• Update LICENSE.md (#410) (@ViralBShah)
• Enable ArrayOfArray Tests (#411) (@arnavs)
• fix convert(Variable, D(x)) (#412) (@YingboMa)
• Update docs (#416) (@mkg33)
• Add convert from ReactionSystem to NonlinearSystem (#417) (@TorkelE)
• reword a few docs / fix typos (#420) (@isaacsas)
• Fix MTK.build_function on "arrays of sparse matrices" and "arrays of arrays of sparse matrices" (#423) (@wupeifan)