v1.1.2

• dir_delete() got rid of system("rm -rf ...") and replaced with native code.

• uninstall-old looks at latest installed version instead of current running version

• change the logic for setting the lowest displyed version threshold
  threshold_major = whechever is lower: latest_available-show_prev_majors or oldest_installed
  So you can keep show_previous_N_majors set at 0 to show only the most recent kernels by default,
  yet still have access to all the kernels from your oldest installed kernel and up.