adds SprintPoints

replaces taskpoints ref calls with a new join query to customfields to retrieve points
removes 'in project' check for transactions to improve performance
refactors SumStatusPoints from TasksTable  into SprintPoints
creates subdirs for view organization
adds index constant for customfield filtering (future)
deletes SprintTask

Change-Id: I660007ccc83323eba98d1415f15c9a9a64ff3a4d