There are 2 different animation formats, legacy one used in OOoXML
format, based on presentation:animations element, and SMIL based one
used in ODF format, based on a node hierarchy with
<anim:par presentation:node-type="timing-root"> at the top.

The problem is that when the legacy animations are imported, they are
not immediately set on the draw-page in the same way as the new
animations are imported.

"soffice --convert-to odp ooo28334-1.sxi" loses all of the animations,
whereas loading the file in the UI and storing it all animations are
converted, and if you use API load/store methods some are converted and
some not depending on timing.

The problem is that there is a necessary conversion step
MainSequence::implRebuild() that needs to happen after all the
EffectMigration calls for a particular SdPage are finished, which
is only triggered by a timer MainSequence::onTimerHdl().

Fix it by forcing a call to implRebuild() from DrawDocShell::Load().

Note: SdDrawDocument::NewOrLoadCompleted() is a horribly misleading
function name as it is actually called *before* loading the document.

Change-Id: I9881cb9bf2ae6ccc5fcf06602343f2d0e0704699