Add -D/--nodates options to hg diff/export that removes dates from diff headers
and replace uses of sed in the tests with --nodates.
adding baseabort: cannot delete applied patch cNow at: bababseriesstatusNow at: aabseriesstatus1 New patch: a0 baseabort: patch e not at basef4 New patch: f3 New patch: e2 New patch: d1 New patch: a0 base