Get rid of some indicators attributes

[YuriGlickman]

Remove indicators from the faceted search.
We should keep only really important attributes of indicators: short name, name and unit.

the users should get a clear message that an indicator defines the type of data.
A proper name for it is the name of the dataset without time and location attributes. Provide an example for that:

for a datatset "CALF 2010 - 2014 Total number of learners who live in East Cambridgeshire"
the indicator name should be "CALF Total number of learners"