largefiles: don't crash when trying to find default dest for url without path
b32e55e6c3c7 introduced a crash when cloning a url without path - where
util.url().path would be None.
This None will now be handled as ''. clone will thus abort with 'repository /
not found' as before.
hgweb.cgi: fix internal WSGI emulation (
issue3804)
The internal WSGI emulation in wsgicgi.py was not fully WSGI compliant and
assumed that all responses sent a body. With
3fbdbeab38cc that caused a real
bug when using hgweb.cgi.
wsgicgi.py will now make sure headers always are sent, using the pattern from
PEP 333 and similar to how it is done in
c007e5c54b16.
bdiff: simplify overflow checks
Rather than check that each delta start, end, and length is within 32
bits, we simply check that the input strings are under 4GB.