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

changed name of a local variable to avoid a later name collision

fixed href bug

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