Newline escape doesn't work in group file template definitions

[antlr]

Newline escape doesn't work in group file template definitions

[sharwell]

The unit tests for this feature were limited to explicitly constructed templates (new ST("...")). I added another set of tests for this feature in a group file like you have; the issue was reproduced so we should be able to get it fixed soon.

[parrt]

this was bugging me and so I decided to change things:

• Reversing decision to use >> and %> as the escapes now for >> and %>.
  Simply allowing >>> is the best, such as <<Hi >>.
  It will strip off the >> and leave > as the appropriate end of expression.
  Added testTripleAngleOnEnds. Even <<>> works now. There is no escape
  for %>.