Add lssect to list all sections from mkit.ini

src/include/ini.sh

     __ini_grepsec "$sct" | cut -d= -f1 | awk '!x[$0]++'
 }
 
+__ini_lssect() {
+    #
+    # List all section names
+    #
+    local arg=$1    # unused argument
+    grep -x '\[.*\]' | sed 's/^.//; s/.$//'
+}
+
 __ini_maybe_expand() {
     #
     # Decide whether or not to expand
     local limit=__ini_cat    # limiting internal function
     case $op in
         lskeys) fn=__ini_lskeys   ;;
+        lssect) fn=__ini_lssect   ;;
         sec)    fn=__ini_grepsec  ;;
         values) fn=__ini_greppath ;;
         1value) fn=__ini_greppath; limit="tail -1" ;;