Issue #7585: use tab between components in unified and context diff headers.

Instead of spaces between the filename and date (or whatever the string
is that follows the filename, if any) use tabs.  This is what the unix
'diff' command does, for example, and difflib was intended to follow
the 'standard' way of doing diffs.  This improves compatibility with
patch tools.  The docs and examples are also changed to recommended that
the date format used be the ISO 8601 format, which is what modern diff
tools emit by default.

Patch by Anatoly Techtonik.
diff --git a/Misc/ACKS b/Misc/ACKS
index b0e89ca..2a031e7 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -747,6 +747,7 @@
 Steven Taschuk
 Monty Taylor
 Amy Taylor
+Anatoly Techtonik
 Tobias Thelen
 James Thomas
 Robin Thomas