counting notes is per table, not on the whole document

Change-Id: Id4afa4eee961f159f8ea8caeac620d101cfb103e
Reviewed-on: https://gerrit.libreoffice.org/6941
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
count notes - GetNotesInRange now include last tab

- refactor tests
- add unit test on counting notes on a sheet

Change-Id: I6762a0e791a745b828800645effdfc044ac33710
Reviewed-on: https://gerrit.libreoffice.org/6954
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>