More useful diagnostic output

When we added "No ticket found" zephyrs (commit 92b9a60), we made a message get
printed for every zephyr we processed.  Unfortunately, it's a really useless
message. This adds a message for every zephyr with the time, class, instance,
sender, and recipient for better diagnostics.
Fix combo and SCIENCE

Commit eb7ace1075 effectively requires that all matchers have at least one
group. For almost all of them, this was already true. For -c assassin's "combo"
(and "combination") and -c axs's "SCIENCE", however, this was not true. This
adds a superfluous group to each of those to restore functionality.