extended-preprocessor: starting a C interface (not finished)
added unscented nodes generator
put nodes generators in setup_integration_nodes.m
added stochastic_solvers to homotopic_steps
extended-path: changed homotopy so that integration nodes change
too (only for for case 1)
Octave testsuite: force gnuplot toolkit for text graphics.

This is necessary since FLTK is now the default toolkit in octave 3.8.
Adds test whether all parameters are set to model_diagnostics.m
Ref. manual: fix default number of periods of forecast command.
Add all-in-one-file example for smoother2histval.
Merge pull request #650 from JohannesPfeifer/parameter_diagnostics

Adds test whether all parameters are set to model_diagnostics.m
trust_region/dogleg: fixing sign error
removing debugging printing
making solve1.m robust to sparse Jacobian
adding solve_algo=9: using trust_region algorithm on the entire model
fixed expectation model test cases. They had a crazy steady state
revealed by the now more accurate nonlinear solver.
Merge branch 'master' into ep
Fix trust region on entire model.
Merge branch 'master' into ep
solve1: initialize fjac only if it needs to be computed numerically.
trust_region: replace a loop with a matrix expression
updating extended_path
Merge changes to extended path