LPS-44908 Remove incorrect escape backslash in portal.properties
LPS-44908 Add upgrade process for thread priorities of message boards
LPS-44908 Test upgrade process for thread priorities of message boards. Also tests older methods in UpgradeMessageBoards.
LPS-44908 Fix "thread priorities" preference storage (they were being written separated by commas, but read as separated by pipes)
LPS-44908 Remove unthrown exceptions
LPS-44908 Use java.util.Collections
LPS-44908 SF