qtmaildir 0.5.0

Completion in the query bar. Every candidate carries a description, so the
bar teaches the notmuch query language rather than only saving keystrokes.

Completes query prefixes, tag names, dates on both bounds of a range,
content types extensible through config, and account directories.
Ctrl+Space opens the popup on demand.

Also fixes two keyboard defects in the bar: Return ran nothing and moved
focus to the thread list, and Tab or the arrow keys crashed the
application while the popup was open.
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