getdate.y: disallow countable dayshifts like "4 yesterday ago"

[pspp] / ChangeLog

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+2008-09-29  Ondřej Vašík  <ovasik@redhat.com>
+
+       getdate.y: disallow countable dayshifts like "4 yesterday ago"
+       * lib/getdate.y (relative_time_table) [tDAY_SHIFT]: New type for
+       exactly specified dayshifts.
+       (dayshift): New rule.
+       (rel): Add dayshift.
+       (relative_time_table) [tomorrow, yesterday, today, now]:
+       Use tDAY_SHIFT in place of tDAY_UNIT.
+       * tests/test-getdate.c: Add tests for now-disallowed countable
+       dayshifts, e.g., "4 yesterday ago".
+
 2008-09-29  Bruno Haible  <bruno@clisp.org>
 
        * tests/test-posix_spawn1.c: Renamed from tests/test-posix_spawn.c.