Version 5.0.0 more HTTP methods and headers

• Support auto directory creation in PUT
• Allow header differs based on writability
• added canonical link header that points to the resolved URL
• added ETag header tracking drive version
• removed index.json extension
• added .well-known/dat
• added X-Resolve:none for disabling resloving index.json
• added X-Blocks and X-Blocks-Downloaded headers for files