openswan_to_pem.py: remove unused imports
remove tshare

I haven't used this in years and I doubt it works at this point.
add maildir_dup_uids.py

If you somehow end up with duplicate UIDs in a maildir, this script will
detect them so they can manually be corrected.
power_outages.py -> aep_power_outages.py
remove pacman_installed.sh
update gitignore