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Solver improvements via IPOPT (gh-124)

This really big commit does a bunch of things in the core:
- Adds the NLP solver IPOPT and its Cython wrapper cyipopt as dependencies
- Removes the majority of the old eqsolver core, while leaving the simplistic treatment of global minimization intact (for now)
- Adds deepcopy support for CompositionSet
- Creates new `Problem` and `Solver` abstractions, which will make it easier to extend the solver in the future to handle different types of problems and constraints
- Tweaks minimum value constants to improve convergence
- Make some equilibrium tests more restrictive

* WIP: Initial memory cleanup work

* WIP: Profiling and memory and speed perf attempts

* WIP: eqsolver constraints and add_new_phases: perf improvements by profiling

* WIP: eqsolver: Remove debugging code

* WIP: nogil in eval_energy

* WIP: eval_energy nogil

* WIP: _eval_disordered_energy and _eval_energy_gradient nogil

* WIP: revert _eval_energy_gradient nogil

* WIP: _eval_energy_gradient nogil fixed with calloc

* WIP: eval_energy_gradient nogil

* WIP: eval_energy_hessian and update nogil

* WIP: eqsolver: type declaration cleanup

* ENH: eqsolver: Add more line search iterations for performance

* WIP: eval_energy: change to pointer for out argument

* WIP: eval_energy_gradient and eval_energy fully release gil

* WIP: eval_energy_hessian fully release gil

* FIX: eqsolver: Add guard for singular matrices during solve

* FIX: eqsolver: Convergence at lower point density by fixing bugs in add-remove-phases step of computation

* FIX: eqsolver: Performance and stability improvements


* WIP: Snapshot with all but one test passing

* REF: Create Solver class and abstract away some of the details from the main equilibrium solve loop

* ENH: CompositionSet: Add GM to CompositionSet.__str__

* FIX: hyperplane: Memory corruption during phase fraction calculation

* FIX: eqsolver: Inf norm calculation

* FIX/WIP: solver: Tweak complementarity tol to get convergence on one test, but break test_rose_nine.

* TST/FIX: Add cyipopt to dependencies

* FIX: Remove NumPyPrinter due to sympy 1.1 incompatibility. Other sympy 1.1 import changes. Fixes gh-105.

* MAINT: eqsolver: Remove dead code

* FIX: add_new_phases: Misalignment of phase fractions array due to non-deterministic sorting of simplex vertex index array

* WIP: add_new_phases: Force endmembers to always be candidates for inclusion

* WIP: Continued attempts at global minimization improvement.

* WIP: add_new_phases: Add all stable phases plus the phase with the largest driving force.

* ENH: CompositionSet: deepcopy support

* WIP: eqsolver: Clean up and simplify global minimization code. Doesn't yet work completely but many tests pass and the performance hit is improved.

* FIX/WIP: Get tests passing at pdens=500 with ipopt. Use a two-step approach to improve ipopt convergence.

* WIP: eqsolver: For pdens=50, pass all tests with solver tweaks for cases near boundary.

* DOC/FIX: BinaryExamples: Bump results and fix error in energy plot.

* FIX: equilibrium: Reset default pdens to 500 to address ternary miscibility gap detection

* BLD/FIX: appveyor: Bump miniconda to fix broken conda

* MAINT: core: Remove obsolete cymem-related code

* MAINT: compiled_model: Remove cython debugging directives

* MAINT: hyperplane: Remove extraneous print statements

* MAINT: Problem: Remove extraneous comments on hessian implementation

* MAINT: solver: Remove extraneous commented-out print statements

* TST/MAINT: test_equilibrium: Clean up assertions

* BLD/TST: travis: Drop py34 and disable Dockerization to ease dependency handling

* MAINT: core: Refactor solver constants to be in core.constants

* FIX/TST: Use matplotlib 'Agg' backend in tests to avoid issues no DISPLAY on CI

* BLD: appveyor: Add msys2 and pycalphad channels to enable ipopt

* BLD/WIP: appveyor: Fix conda channel add

* FIX: equilibrium: dask module rename compat

* FIX: calculate: Remove fast_concat due to reliance on xarray internal API

* FIX: custom_autowrap: Import correctly on Windows

* FIX: solver: Increase ipopt max_iter to fix Windows

* BLD: appveyor: Bump py27 to 64-bit

2744 of 3135 relevant lines covered (87.53%)

4.36 hits per line

Jobs
ID Job ID Ran Files Coverage
1 1149.1 34
87.18
 Travis Job 1149.1
2 1149.2 34
87.18
 Travis Job 1149.2
4 1149.4 (TRAVIS_PYTHON_VERSION=2.7) 34
87.18
 Travis Job 1149.4
5 1149.5 (TRAVIS_PYTHON_VERSION=3.5) 34
87.18
 Travis Job 1149.5
6 1149.6 (TRAVIS_PYTHON_VERSION=3.6) 34
87.18
 Travis Job 1149.6
Source Files on build 1149
Coverage ∆ File Lines Relevant Covered Missed Hits/Line