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See https://developer.gnome.org/hig/stable/typography.html

https://bugzilla.gnome.org/show_bug.cgi?id=774377

Two changes being done:
a) special value 'stdout', or an empty string, for 'filters-log-file'
   will make logging into stdout
b) running with CAMEL_DEBUG=filters also turns on logging to stdout.

The output file from GSettings has precedence over the stdout used
by CAMEL_DEBUG, when both loggings are enabled. In other words, in case
GSettings has enabled logging, then GSettings dictate which file is
used for the log, otherwise GSettings values are ignored and stdout
is used only when CAMEL_DEBUG logging is enabled.

The accounts were in some artificial disorder, better to use the same
order as the folder tree, then eventually name/mail address. Aliases
are right below the main address of the account they belong to.

See https://developer.gnome.org/hig/stable/typography.html

https://bugzilla.gnome.org/show_bug.cgi?id=774377

These used to show their raw names in the UI, which didn't look correct.

This properly updates sources for inclusion also when adding/removing
them for alarms, while the previous behaviour listened only for source's
enabled/disabled/added/removed notifications, which was not correct.

Related to bug #739955, where is also a little explanation [1] what led
to this change.

[1] https://bugzilla.gnome.org/show_bug.cgi?id=739955#c22

This way one can "duplicate" an event in the calendar. Move To Calendar
still requires the source and the destination calendars being different.