HPCC-8191: WsEcl support for building REST URLs (HTTP-GET)

Add a link to the Links tag to get an example (unpopulated) REST URL.

Also add support to the generated form to make calls using HTTP-GET
which can be used to build specific REST URLs with the provided
parameters filled in.

Signed-off-by: Anthony Fishbeck <Anthony.Fishbeck@lexisnexis.com>
HPCC-8191: Use jlib rather than stl for consistency in WsECL

Also fix typo in wsecl3_form.xsl

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
HPCC-8191: Update based on code review

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
Merge pull request #5387 from afishbeck/wseclRestURL

HPCC-8191: WsEcl support for building REST URLs (HTTP-GET)

Reviewed-By: Gordon Smith <gordon.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>