Adding GECKO_1_9_1_BASE tag (details in full commit message).

This tag indicates the point where http://hg.mozilla.org/mozilla-central was cloned to http://hg.mozilla.org/releases/mozilla-1.9.1 for final 1.9.1/3.1 development and maintenance releases.

.hgtags

@@ -24,3 +24,4 @@ f197b51bbc29a30860e750ee87fd0a047a024f2e UPDATE_PACKAGING_R6
 d7d64f68423b68a671f623f123e90057ebc49dac UPDATE_PACKAGING_R6
 0000000000000000000000000000000000000000 THUNDERBIRD_3_0a3_BUILD1
 0000000000000000000000000000000000000000 THUNDERBIRD_3_0a3_RELEASE
+0cd41f5990807fb6ab52cb59ba3c8e8247281045 GECKO_1_9_1_BASE