rework file directive handling; remove T_Group; add SKIP to disable

tests that are not passing; change command line syntax for easier
test run/skip/force; updated help; shortened --dbg_graphical -> --gui;
add 'skip' directive to the dbg scripts

run.sh

@@ -38,6 +38,10 @@ while [[ $# -gt 0 ]]; do
   esac
 done
 
+if [[ "${#torture_args[@]}" == "0" ]]; then
+  torture_args=("*")
+fi
+
 for m in "${mode_values[@]}"; do
   for c in "${cc_values[@]}"; do
     # nuke artifacts from last run