Clarify/Display Data Currency prominently

[jj0hns0n]

From Darren:

The data related to a dataset is when it was uploaded and doesn't alter if data changes, I think this needs changing so people can see the currency of the data, can this be achieved?

[unmeerim]

Any joy with this (this is first post so a test my new account works)

[jj0hns0n]

Here are the 2 places that metadata is set and displayed currently. @unmeerim should we just make this more prominent?

[jj0hns0n]

@unmeerim also note that I changed this one to Revision date as an example for @vdeparday http://ebolageonode.org/layers/geonode:sle_admn_ad4_py_ocha_section

[jj0hns0n]

From @unmeerim : Have default 'Date type' to be 'Creation' if not 'Published', take 'Publication' if no 'Revisions' done