Optimization under uncertainty using adjoint formulation now works in this...

Optimization under uncertainty using adjoint formulation now works in this version.  demo_uq_opt_1_s_par.m and demo_uq_opt_2_s_par.m in /coco_example_runs/ch_4_linode_robust_optimization offer examples of this functionality.  Modified uq constructor such that it only creates the sample and moved addition of response functions to a separate function which allows multiple response functions to be added to a single sample.  Updated Ch3 demo function to use this updated construction method.  Added some utility functions for querying what responses and samples are in a given uq problem.  Added a simple function, uq_coll_plot_samples, for plotting sample trajectories.  Cleaned out several old demo functions and unused uq_ functions.