If I try to send a message to an unknown user (which is possible
for some types of realms), then I simply ignore them during the
send codepath, so that I don't later need to patch up their attributes.
We no longer store pm_recipient_count on person objects, but we
instead use a Dict to store them. Then the new API is this:
people.get_recipient_count()
people.incr_recipient_count()
These tests would work as part of the whole suite, but
not standalone, because they were getting objects out
of node's require cache that a previous test had cleaned up.
Now they should work standalone as well, and the tests
are more explicit about their dependencies.
Previously, we were checking if a particular user was the current user
in dozens of places in the codebase, and correct case-insensitive
checks were not used consistently, leading to bugs like #502.
