- rename --vetoes to --veto-segments-file
- add --frame-segments-file and --frame-segments-name to provide an
  optional frame segment list

- fix crash when there is no non-gap data to flush at EOS by adding an
  explicit check for no-ops before triggering a g_assert()

out of tree builds fail because $(top_srcdir) is used where $(top_builddir)
was intended