button: don't exit if we cannot handle a button press
analyze: plot the time spent setting up security modules
build-sys: subtract list of exported symbols from "check-api-unused" list
bus: use ENXIO as error condition when trying to exit a container when we are not in any

So far we used ENXIO whenever the user tried to read something from a
function that didn't carry the right type, and hence use the same error
here to indicate that what the user expected and what was in the message
didn't match up.
bus: actually export sd_utf8_is_valid() and sd_ascii_is_valid()
bus: we really need to get rid of the :no-sender hack

This is where a hack from PID 1 spilled into the client side. We need
to get rid of this as soon as PID 1 is converted to libsystemd-bus.
udev.xml: minor fixes to network link configuration

- Refer to net_setup_link, not net-setup-link
- Mention the required file extension earlier
udev.xml: add missing </para> tag
timer: properly format relative timestamps in the future
timer: consider (usec_t) -1 an invalid timestamp
systemctl: add new "list-timers" command
bus: add APIs for adding iovecs to messages as string or arrays
systemctl: avoid unitialized access when showing 0 timers
shell: add list-timers to systemctl completions
systemctl: warning: ‘r’ may be used uninitialized in this function
bus: rename sd_bus_send_with_reply_and_block() to sd_bus_call()

The call is one of the most important ones we expose, where we place
major emphasis on. We should make sure to give it a short, memorable
name.
test: fix minor memory leak in test-event
bus: introduce concept of a "default" event loop per-thread and make use of it everywhere

Try to emphasize a bit that there should be a mapping between event
loops and threads, hence introduce a logic that there's one "default"
event loop for each thread, that can be queried via
"sd_event_default()".
bus: introduce concept of a default bus for each thread and make use of it everywhere

We want to emphasize bus connections as per-thread communication
primitives, hence introduce a concept of a per-thread default bus, and
make use of it everywhere.
bus: export utf8 validator calls as pure functions