DAVFS:  send the Content-MD5 header if we know the md5 of the file
DAVFS:  send the Content-MD5 header if we know the md5 of the file


git-svn-id: 74b2def6592cf29d88d1a5d33b5c4a2732d8507c@522 67cdc799-7952-0410-af00-57a81ceafa0f

pscottdevos/pyfilesystem,alekibango/pyfilesystem,anthonybishopric/pyboxfs,duedil-ltd/pyfilesystem,anthonybishopric/pyboxfs,simonluijk/pyFilesystem,alekibango/pyfilesystem,revolunet/pyfilesystem,pscottdevos/pyfilesystem