In TracTimeline, show the common location for the file entries of changeset events.
This is a follow-up of what r4676 did for the TracChangeset view itself.
The existing TracIni setting `changeset_show_files` is reused: {{{ [timeline] changeset_show_files = location }}}
Implements #3274.
Authored by: cboos 2007-02-01
Parent: [r4676]
Child: [r4678]
