Fixes for tickets 96, 97 and 98

Added Changeset16 to create ownership shares for #96.
#97 Fixed problem where services tried to set the notation ref to
NULL if it was empty string. 33 Notations were migrated from
LRS with a blank notation ref.
#98 Fixed problem where id for survey_point was not allocated.
[#96 #97 #98 state:fixed responsible:none milestone:v2.1.5]