Coopr 3.1 Release

It is pleased to announce the release of Coopr 3.1 (3.1.5325). Coopr
is a collection of Python software packages that supports a diverse
set of optimization capabilities for formulating and analyzing
optimization models.

The following are highlights of this release:

- Solvers
   * Interfaces for !OpenOpt solvers
   * Many solver interface improvements
   * A solver checker to validate solver interfaces
   * Improved support for SOS constraints (cplex, gurobi)
   * PH supports nonlinear models
   * PH-specific solver servers

- Modeling
   * Comprehensive rework of blocks and connectors for modular modeling
   * New !VarList component
   * Added comprehensive support for set expressions

- Usability enhancements
   * New 'coopr' command has subcommands that consolidate Coopr scripting
   * Added support to connect to databases with ODBC
   * Made JSON the default results format

- Other
   * Efficiency improvements in model generation, memory, runtime, etc.
   * Preliminary support for black-box applications
   * Deprecated modeling syntax in Coopr 3.0 is no longer legal

See https://software.sandia.gov/trac/coopr/wiki/GettingStarted for
instructions for getting started with Coopr.  Installers are available
for MS Windows and Unix operating systems to simplify the installation
of Coopr packages along with the third-party Python packages that they
depend on.  These installers can also automatically install extension
packages from Coin Bazaar.

Enjoy!