September improvements

Created an admin page 2 for future expansion.

Created header include file for admin pages.

Added set_time_limit() to several admin pages for df command taking
too long.

Switched to curl with timeout to improve Internet IP checks.

Admin header now shows Internet IP check retries if they exist.

Grub.cfg now backed up in /boot/grub2/.cfg/.

Created admin pages for the to-do list and notes.

Add page refreshed every x minutes to header of several admin pages.

Yum clean all now run before every updates testing check.

Replaced displayed date with “today” and “yesterday” on more admin
pages.