fixed zero-length format string in ls_size_str

fixed href comparison in parse_response_tag

reimplemented redirects for propfind requests

using Depth: 0 for non collection resources

don't allow signs for date strings (always expect full years)

added parser for iso8601 dates

definition: lastmodified and creationdate shall be zero on parse error

added fallback for util_parse_lastmodified, because some servers incorrectly use ISO-8601 dates for lastmodified - TODO: implement the ISO-8601 parsing

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