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The incidence editor creates DATE values for exceptions to recurring
instances, even if the incidence is not "all day" (i.e. DTSTART is a
DATE-TIME value).  EXDATE identifies a specific instance and arguably
should follow the same rules as RECURRENCE-ID.  RFC 5545 does not say
so, but [erratum 6316](https://www.rfc-editor.org/errata/eid6316) does.
In practice, other important systems reject EXDATEs that do not match
DTSTART.

Original patch written by Jochen.Trumpf@anu.edu.au.

BUG: 169336
BUG: 434599
FIXED-IN: 5.17.0

The incidence editor creates DATE values for exceptions to recurring
instances, even if the incidence is not "all day" (i.e. DTSTART is a
DATE-TIME value).  EXDATE identifies a specific instance and arguably
should follow the same rules as RECURRENCE-ID.  RFC 5545 does not say
so, but [erratum 6316](https://www.rfc-editor.org/errata/eid6316) does.
In practice, other important systems reject EXDATEs that do not match
DTSTART.

Original patch written by Jochen.Trumpf@anu.edu.au.

BUG: 169336
BUG: 434559
FIXED-IN: 5.17.0

GIT_SILENT: add sanitizers.supp so we can suppress some leak generated by some lib (as libfontconfig)

The user interface uses "tag" and "category" as terms for the same thing.
Settle on "tag", for consistency among Akonadi applications.

GUI:

The dialog classes are not used anywhere, and AutoCheckTreeWidget
is only used by the dialogs.

Pass an `Item` instead of an `Incidence` so that any tags added to the
new incidence will be passed along with it.