add grouping when creating a corpus from HAL
When creating a corpus from HAL, the institutes are grouped by default using the field instStructIsChildOf_fs
from the HAL API.
I also put the number of map term for the Institutes to 300
because the grouping wasn't working when the parent Institute and the child Institute weren't not in the same type (e.g. map and candidate). It's arbitrary so it could be changed at any time.