BUG UnsavedRelationList aren't checked

When saveInto is called on ListboxField and CheckboxsetField,
UnsavedRelationList should be an acceptable relationship type. This is
leading to relations not being saved on initial creation of Member
objects
Merge pull request #1204 from dhensby/unsavedrelationlist-improvements

BUG UnsavedRelationList aren't checked
Allow setting the MySQL database port
Allow setting the database port in _ss_environment
Merge pull request #1301 from simonwelsh/mysqli-port

Allow setting the port for mysql and setting it in _ss_environment