Description

addOptional parsing is suboptimal for our purpose:

1. It doesn't allow customized error messages
2. It doesn't allow default values for the middle parameters

We have to revise and possibly revert the use of addOptional in the entire code.

Tasks

• Fix Testing/xASL_test_TestExploreASL.m
• Fix Functions/InputOutput/xASL_io_dcm2nii.m
• Fix Functions/Administration/xASL_adm_FindByRegExp.m
• Fix ExploreASL_Initialize.m

Release notes

Fixes input parameter checking at multiple locations and optimized internal variables.