remove lower() since it breaks artifact dependencies

matlab/run_gdat_tests.m

@@ -4,7 +4,6 @@ function [passed,results] = run_gdat_tests(test_case,coverage_report)
 if nargin==0 || isempty(test_case)
   test_case = 'all'; % default
 end
-test_case = lower(test_case); % lowercase
 
 if nargin < 2
   coverage_report = false; % default