- sometimes we produced unreadable pptx document with custom shape presets
 - fixes part of n#760997
 - before we rely on simple rule that adjustments were named
   adj1, adj2, ... in case of multiple adjustments and named
   adj in case there was only one. there are few exceptions though,
   so now we use exact adjustment names defined in presetShapeDefinitions.xml
 - TODO: there still might be problem when exporting custom shapes, which
   didn't originated in pptx import

Change-Id: Ic9517a69145a295ba6f680ddc3cc30fc771db3fd