Tidy ESSGlobal

[ColmMassey]

Let's do a sanity check of all the schemas we are using and do a tidy of ESSGlobal before others start using it.

See #54 (comment)

[ColmMassey]

@wu-lee Shall we schedule a time to review the schemas? I recall you said you wanted to do some preparation before having the meeting. How long do you need?

[wu-lee]

I'll take a stab and say next week? I'll have a look at the schemas in the mean time and see if that makes me back off from that :)