Event filtering items

[peterfpeterson]

These tasks were discovered when using SEQ_31276.

For FilterEventsHighFrequency

• Have it inherit from DeprecatedAlgorithm rather than just having a comment in the algorithm description
  For GenerateEventsFilter:
• The TimeType variable is unclear in its usage/meaning
• When splitting using SampleTemp from 276 to 288 in steps of 1, the tables generated start at 275.5 degrees rather than 276.
• Change the name of the parameter SplittersInformationWorkspace to InformationWorkspace
• Both the OutputWorkspace and the SplittersInformationWorkspace should agree on the common column heading of WorkspaceGroup and the values should match rather than be one off (information starts from zero, output starts from one)
• For the run being used, there are several rows in the OutputWorkspace that have zero time between the start and stop (rows 3 through 7 in my test). They should not appear.
  For FilterEvents
• Events that are not filtered should go into a workspace named OutputWorkspaceBaseName_unfiltered
• Similar to GenerateEventsFilter, change the name of SplittersInformationWorkspace
• Change InputSplittersWorkspace to SplitterWorkspace

[peterfpeterson]

This issue was originally trac ticket 6348