(issue1448) Fix info service for epoch / periods and off epoch This also includes a bit cleanup to move the sqRelationTimeInterval check to the creation of the load list in SedimentLoadData allLoads.

SYMBOLSET
SYMBOL
  NAME 'point'
  TYPE ELLIPSE
  POINTS
    1 1
  END
  FILLED TRUE
END
SYMBOL
  NAME "square"
  TYPE VECTOR
  POINTS
    0 0
    0 1
    1 1
    1 0
    0 0
  END
  FILLED TRUE
END
END