Fix revlog-ng interaction with old-http. revlog.py wasn't trying to detect the version of a revlog file that doesn't exist on the filesystem (as is the case with old-http). Additionally, there was an off-by-one error in httprangereader.read (ranges in HTTP Range headers are inclusive), making it get more data than what was asked for. This made a struct.unpack complain that "unpack str size does not match format". Finally, with the two fixes above, test-static-http fails, since BaseHTTPServer doesn't understand ranges and returns too much data. Work around that by reading only the specified amount.

--- a/mercurial/revlog.py	Wed Apr 26 22:15:01 2006 -0700
+++ b/mercurial/revlog.py	Wed Apr 26 22:42:07 2006 -0700
@@ -333,8 +333,8 @@
                     and st.st_ctime == oldst.st_ctime):
                     return
                 self.indexstat = st
-                if len(i) > 0:
-                    v = struct.unpack(versionformat, i)[0]
+            if len(i) > 0:
+                v = struct.unpack(versionformat, i)[0]
         flags = v & ~0xFFFF
         fmt = v & 0xFFFF
         if fmt == 0: