#862 Add new method to DBInterface for removing alternative contact text
#862 Add new method to PostgresDBConnector for removing alternative contact text
#862 Update BBUserSettingsHandler to support clearing of alternative contact text
#862 Add remove_alternative_contact_text method to ABC for DBConnector
Increase field lengths as have discovered that they were a bit too small
#862 Tidy up logging
Merge branch 'feature/#862_SET_CONTACT_CLEAR_clears_alternative_contact_text' into develop