Quote replies properly when re-wrapping

When re-wrapping text that already has email quoting, the
quoting should be maintained in the newly re-wrapped text.
See:

http://issues.bestpractical.com/Ticket/Display.html?id=16857
When wrapping, keep existing line breaks

When wrapping, honor existing line breaks and only wrap within
a line. This avoids combining intentional multi-line text into
a single paragraph.
Rename quoting tests to avoid a filename conflict upon merge
Remove an extra "my" which causes "masks earlier declaration in same scope" warnings
Merge branch '4.0/text-wrap-and-quoting-long-lines' into 4.0-trunk

Conflicts:
	lib/RT/Transaction.pm