added lock and unlock commands to dav

added API for webdav locking

fixed hash verification and head requests

changed libidav property namespace and version number

fixed some warnings and wrong usage of curl_easy_getinfo

added trash-info and empty-trash commands

fixed add-directory command

fixed dav-sync crash when sync.xml is missing

auth input for dav get, put, mkdir and remove commands

added add-directory command to dav-sync

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