Shapes may not have a unique name, but TextFrames always have. So in
order to be able to link shapes with textboxes, provide a ChainName
property that's the name of the underlying TextFrame. This kills two
birds with one stone:

- we can have a unique name for each shape
- the names can be used for TextFrame linking, as they are valid
  TextFrame names

Change-Id: Ie96f267d392d9fe5388c5eacff9b873f1639054c

At the moment it's only possible to set this property, and it only sets
the same property of the underlying textbox, if there is any.

Change-Id: I9f168f69a8e92a1b26f21e653a05c97e2e32297c

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...that's why the problem fixed in 0466c0dc "Set
mxStyleSheetPool before using it" had never caused trouble in practice (and its
change to SdDrawDocument ctor can be reverted again)

Change-Id: I662995ab4fcaa7ae461cb9575666825d8a869735

"do what I mean"

In master pages prior to this if we toggle bullets on and off the that changes
the *level* of the paragraph. And because the paragraph is effectively a
preview of the equivalent style level, changing the level disconnects it from
the style which is useless for us.

So instead turn the numbering off at the given outline level. In order to
toggle the numbering back split the defaults-setting into a reusable piece that
sets the numbering indent which we can call to toggle numbering back on

Also split out the broadcast style change *and explicit child* broadcast code
into a reusable method, the absence of which left me stumped for well over an
hour as to why my changes only worked on level 1

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