writerfilter: unused checkmodel.xsl

This could be useful actually, except that it raises so many warnings
for ~any version of model.xml (and we assume the current version is more
or less working), that I think in its current form it's useless.

Change-Id: Ia9923256f1db0fd15930833fc843a7348613821d
SwFmtVertOrient: rename member variables missing their prefixes

Change-Id: I83922fa1abe7830b12fcd811c9391ae8fff853c9
coverity#1078573 Unchecked dynamic_cast

Change-Id: I59d179b2b9ad19de1be2bae517201be038f32c33