Manage DEIMS api versions

[ptagliolato]

New API are coming. We must be able to adapt our logics to changes.
We can test on pre-production site with different url.
Proposal (partially done):

• create global but adjustable package setting with base deims url (configurable in one's system variable) - done
• use package onLoad function to possibly change the base url variable reading from system. - done
• use a function to read from baseurl/api the deims version - done
• set a global (changeable) package setting to the read version (it's a string). - TODO
• put JQ queries in a variable (list) containing slots for API versions (e.g. jq_queries$'1.0' will be a list).
• adapt each function that contains a jq query to the new pattern: move the jq code into the JQ_queries variable. - STARTED for api version "1.0"
• add jq queries for version "1.1" and test the package against the pre-prod new version of deims - TODO

[oggioniale]

the commit 5ff2b3d solve this issue