Log Message:
Add comment explaining why subversion isn't at 1.6.0 yet:

# As of 2009-03-22 gdt@NetBSD.org knows 1.6.0 is out, but is
# intentionally waiting until post-2009Q1 and until there is enough
# experience with 1.6.0 before subjecting pkgsrc users to it.  Update
# will probably come mid to late April; comments welcome.