Pyomo

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- Solvers
- Various fixes for Gurobi and CPLEX
- Reorganized OS services in pyomo.os

- Usability enhancements
- Improved robustness of pyomo_install
- Default install of pyomo_install from PyPI

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- Updating dependencies for Pyomo.

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- Patch fix for pyomo.colin

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- Modeling
- Concrete models are now supported
- Nonlinear modeling extensions using the AMPL NL problem format
- Add support for immutable versus mutable parameters.
- Support for SOS1 and SOS2 constraints

- Data Integration
- Can now import data from relational databases

- Solvers
- Better support for Gurobi solver
- Direct CPLEX solver interface
- Interface to ipopt and nonlinear solvers via asl (just to be clear)
- ASL solver interface can now be specified with the form
--solver=asl:PICO

- Usability enhancements
- Numerous bug fixes.
- Updated messages to provide clearer indication of modeling errors

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- A preliminary Gurobi solver interface

- Extended syntax for data command files:
'include' command to load other data command files
'import' command to load data from other sources
namespaces to next data declarations

- The pyomo_install script can install packages from Coin Bazaar

- New conversion scripts to generate LP or NL files from Pyomo models

- Solvers now extract standard suffix information

- Various fixes to PySP solvers

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- Reorganization of Pyomo into separate packages:

- pyomo.opt 2.0
- pyomo.util 2.0
- pyomo.plugins 2.0
- pyomo.core 2.0
- pyomo.pysos 2.0
- pyomo.sucasa 2.0

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