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

enabled cert verification

added list-repositories and list-directories commands

added cleanup code in cmd_add_repository

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