New Protogen release - featuring sequences.

Note: the current Protogen documentation for the VM is no
longer up-to-date.
Add warning about outdated Protogen docs.
Merge remote-tracking branch 'origin/topic/bf_new_release_protogen' into develop

* origin/topic/bf_new_release_protogen:
  Add warning about outdated Protogen docs.
  New Protogen release - featuring sequences.
Release version v0.2.4-rc203.