Merge pull request #376 from JohannesPfeifer/master

Add Andreasen et al pruning at order=3, add unit test for third order perturbation
Compatibility fixes for Octave
Add 3rd order unit test to testsuite
Remove obsolete stuff from pow/log aux vars
Detect if an extended_path statement is present

Unused for the time being
Add new model option 'differentiate_forward_vars' (ref. #351)
reporting: @graph: add option shade_opacity
reporting: @graph: add shade_color option
faster load_csv_file_data on Matlab using importdata
Fix comment blocks
fix typo
Merge pull request #377 from JohannesPfeifer/master

Fix small bug in print_info
Fixed bug with calls to dsge smoother which were broken with missing values;
Proper use of dataset_ structure and remove the dangerous dat_fil_ utility;
Added r2 in output.
Merge pull request #380 from rattoma/master

GSA fixes for rmse analysis
Documentation of new differentiate_forward_vars option

Ref #351
Bug fix: when no analytic derivation and change in x very small.
-) fixed bug introduced in commit 66527df;
-) estimation options for data set must be given also when ppost=1 (fix in testsuite);
Merge pull request #382 from rattoma/master

bug fixes in mode_compute=5 and gsa
Merge pull request #379 from JohannesPfeifer/master

Bugfix in initial_estimation_checks; making graphs more explicit