Upgrade M/R lib.
Minor cleanup
Remove code duplication
Remove unnecessary calls to super() and this() in MimeProperties
Read mime BodyPart content properly
Add email type to MailServiceTest.getEmail()
Add specific test to check if text mail body is automatically created from html body
Extract reading of test system property into separate method
Invert if conditions
Add "mail from" tests
Simplify reading of system properties declared when running tests (TCK_PROPERTIES)
Enable mail service tests on CapeDwarf
Close stream.