changed mkdir to make_path

[TavorB]

Thanks for the great codebase. A minor issue that recently came up: the code was failing with error message "failed: 139 at {my_path}/TRUST4/run-trust4 line 55". In the end, it turned out that this was due to me specifying an out directory with --od that didn't exist. This led to an error with the mkdir command:

TRUST4/run-trust4

Line 366 in 183fb6f

mkdir $outputDirectory if ( !-d $outputDirectory ) ;

. Modified to use make_path. Thanks again!

[mourisl]

Thank you for the update! The mkdir could not handle recursive directory creation, and your update allows that, which is great! I have merged it to the master branch.