Cosmetic Changes to Graphs
Make UnivariateSpectralDensity save plots to graphs-folder

Also make the plots obey the nodisplay option
Make error message for prior violation more explicit by adding second argument to info()
Fix bug where initial_estimation_checks was performed on prior mean instead of specified mode

If the mode_file option was used, xparam1 was reloaded from the
mode-file after the initial checks, sometimes leading to very cryptic
errors. Now the initial checks already load the correct parameter
vector.
Suppress output of row_header_width
Provide stability mapping with more expressive figure titles
Make sure GSA only computes statistics on original endogenous variables, not auxiliary ones
Provide Redform Mapping with more expressive figure titles
Provide RMSE with more expressive figure titles
Make rplot save figures in graph-folder and obey nodisplay option
option
Use filesep instead of '/'
Replace relative by absolute filenames

Closes #329
Make Stability Mapping more readable.

Increased linewidth and changed color to differentiate from background
grid.
Fix bug introduced in df611e9e9dcf3e53bf52bac10e1d757f8127f347
Adds mod-file of a well-documented non-linear New Keynesian model with
recursive formulation of price setting equations where the steady state
file is used to update parameters and invoke a non-linear solver.
Create graph folder in rplot if it does not exist
Make traceplot and mh_autocorrelation save graphs; add legend
Fixed bug in name2index

Previously, the strings were concatenated, rendering calls to strmatch
wrong. Changed to cell arrays on which strmatch operates.
Capitalize figure title in mh_autocorrelation_function
Merge pull request #382 from rattoma/master

bug fixes in mode_compute=5 and gsa