Time delimiters needed for reporting and analysis

[dommitchell]

As the data grows and changes, it's becoming increasingly more important to be able to analyse the dataset with time delimiters. Examples of these would be:

• year added to DOAJ
• year removed from DOAJ
• number of articles added year on year
• number of articles added per month
• number of journals added/removed per month
• applications received since [DATE]
• journals added since [DATE]

I'm envisaging some sort of year facet, probably in the Admin view first that we could display publicly later on.

[richard-jones]

we should be able to break everything down by country, eg number of journals added per month per country, number of article added per year per country, etc.