Update construct.json

#1848 - Add FLAG as an enum option for tags
Update target.py

#1848 - Add FLAG to the tag_targets array for upgrade
Support name as a item identifier
Disambiguate platform property name
Allow mitochondrial editing (whatever that is)
Upgrade inserts with new schema property name
Update required property to match schema property
Fix logic of getting organism name.
Merge branch 'master' into 1492-audit-logic-fix
Scripts for checking file status and updating status.
Merge pull request #466 from ENCODE-DCC/1822-talens-14

1822 talens 14
Merge pull request #465 from ENCODE-DCC/1848-add_FLAG

1848 add flag
No need to fetch datasets, all the information we need is in the file.
Add missing import
Merge pull request #467 from ENCODE-DCC/1492-audit-logic-fix

#1492 audit logic fix
Merge remote-tracking branch 'origin/master' into 2380-not-reviewed-color