Dimcli

* Support for multiple API endpoints (V1 / V2)
* Support for parallel querying of distinct Dimensions servers
* CLI: `.record_notebook` utility removed. Use instead `.export_as_jupyter`

* DSL grammar updated for version 1.31 (2021-05 release)

* DSL grammar updated for version 1.30 (2021-03 release)

* CLI - new `export_gist` command to export query as a Github Gist
* Fix for `extract_affiliations` UTF-8 bug

* Improve warning messages for deprecated modules
* Add cumulative warnings to `Dsl.query_iterative`
* Fix for dimcli CLI not showing records previews correctly

* Dimcli module level documentation vastly updated
* See https://digital-science.github.io/dimcli/modules.html
* new `utils` module: misc utilities all grouped under `dimcli.utils`
* `dimcli.shortcuts` is deprecated in favor of `dimcli.utils`
* the pyvis wrapper is now located at `dimcli.utils.networkviz`
* new magic commands:
* `%%dslgsheets`
* `%%dslloopgsheets`
* `%%extract_concepts`
* `%%identify_experts`
* new DSL functions Python wrappers:
* `extract_affiliations`
* `identify_experts`
* `build_reviewers_matrix`
* CLI - command line tool options improved
* options `-w` for webapp search, `-i` for webapp object ID resolver