Fix to the STIX export fixes #311 and a temporary fix to an OpenIOC import issue

- STIX export had 2 issues as pointed out by RichieB2B:
    - Incorrect name assigned to incidents due to copy-pasta fail
    - Historyitems incorrectly handled

- For the OpenIOC import:
    - Mapping DnsEntryItem/Host to hostname
    - Mapping of hostnames to Network activity failed due to incorrect capitalistion
    - Temporarily removed the ignore function on certain indicators. Ignoring an element in an AND-ed branch happens without a pruning of the element IDs
Version updated
Merge branch 'hotfix-2.3.19' into develop