refactored L::Utils::get_yaml to only require args needed for construction of path/to/yaml_dir/filename to remove duplication from components requiring a get_yaml_file() method (Controllers, Model & ScriptHelpers)}
git-svn-id: https://jti.org.uk/svn/hmds_lims/trunk@1441 4177bd82-f056-0410-812d-caef170e3fa0