Convert (most of) the test data files into genuine XML. A handful still

are not, due mainly to the lack of support for XML character entities
(e.g. & => & ).  This will make it easier to validate test files using
tools like xmllint, as well as edit and view them using XML tools.

tests/data/test249

@@ -1,3 +1,4 @@
+<testcase>
 #
 # Server-side
 <reply>
@@ -43,3 +44,4 @@ If-Modified-Since: Sun, 12 Dec 1999 12:00:00 GMT
 
 </protocol>
 </verify>
+</testcase>