Fixed issue with vec trig params
Fixed issue with order by

If invariant has computed parts, place these first and make the
cond after this but before other
Fixed support for LDP

* Added support for paging
* Added precondition in HTTP PUT to check for containers and use
  pretty TTL for LDP output
* Added OPTIONS headers in GET requests over LDP
* Added tsuite tests
* Fixed issues with MKCOL
* Removed redundant code
Merge remote-tracking branch 'upstream/develop/7' into develop/7
Merge branch 'develop/7' of https://github.com/jplu/virtuoso-opensource into develop/7