After commit fc861c70 there is now an order
dependency, between any ScPatternAttr flags indirectly set and
SheetDataBuffer::finalizeImport which sets the attributes directly for a column
So the ATTR_MERGE_FLAG that has ScMergeFlagAttr ( and associated
 SC_MF_AUTO flag ) is scrubbed when by the direct writting of the attribute
from SheetDataBuffer::finalizeImport -> Document::SetAttrEntries
I've reordered that Table import here and split the finalize ( which happens
before heetDataBuffer::finalizeImport ) so that the databaseranges which were
created before sheet import still happens, the autofilter part of the import
is now deferred ( until after SheetDataBuffer::finalizeImport )

Change-Id: I11bb45ee7b330760fd93ecca30b23399414ac3a7