Add HTTPS support for READ-XML, READ-JSON

[Jens Dahlin]

READ-XML, READ-JSON and LOAD can be used to make datasets, temp-table and of course x-documents handle REST-based web services very easy. Since there's only support for HTTP and not HTTPS this support is sadly limited. Since REST based servers are a big thing in 11.x I think a natural thing would be to add a more complete REST-based client as well. The possible workarounds include using some kind of os-dependent url-calling program like wget or curl. The syntax of these programs differ between platforms and including os-dependent programs generally makes it harder to move between platforms. This is something Progress has identified and worked around by creating the various OS-methods in the ABL (OS-COPY, OS-RENAME etc). Another possibility, writing a socket based HTTPS-client and use that to call REST-servies, is very complicated.

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