Description of problem:
Repeat listing (list without any options) occurs for circumstances that can be
confusing to a user.  For example: in frame 0/file a, down to frame 1/file b,
back to frame 0/file a.

Risk of applying change:
Low.  The change turns off repeat processing.

Risk of not applying change:
To get the same effect users would need to list by line number: line N

Steps to Reproduce:
Run the test script on an unpatched fhpd.

Actual results:
list 3 will not be the same as list 1

Expected results:
list 3 will be the same as list 1