Added paragraph about the different freeze types and a timetable.

doc/releases.txt

@@ -1,7 +1,17 @@
-2002-03-17
+2002-09-26
 
 This text summarizes some points to pay attention to when a new realease
-of sane-backends should be made.
+of sane-backends should is planned.
+
+Timetable (approximate periods):
+
+Day  0: Announcement of upcomming release on sane-devel including timetable
+Day 14: Backend freeze (no new backends are allowed to enter the distribution)
+Day 21: Feature freeze (only bugfixes + documentation updates)
+Day 35: Code freeze (only fixes for bugs that can destroy hardware, can cause 
+        compilation problems or render a backend completely unusable, and
+        documentation updates are allowed)
+Day 42: Release
 
 Before the release: