cp#2013101510000026: wrong highlight of commented text range imported from doc

When makeFieldBookmark() method is called with
ODF_COMMENTRANGE it will ignore the added field name and
generate an own one. We have to set the name of the
SwPostItField to this generated name so these two names will match.

Note: lTagBkmk is only an identifier but not the exported name
of the fieldmark so we don't need to stick to use it as
a name.

Change-Id: I499abdcce1be0563c308bcf9f5c0a959a07f858b
cp#2013101510000026: fix doc export of comments initials

It seems comments' authers were exported twice. Once istead
of initials.

Change-Id: I082fb5caea99df013922e16c5d8d4ef29e866665
cp#2013101510000026: doc export of commented text ranges

Change-Id: I2d31da5d659edcbebc682d5604d2db24b5e341fb
cp#2013101510000026: doc import of comments affecting more text nodes

Change-Id: I3932d82cb4cd640b19957b93cc7e59711af1b564