Updated metadata per Redmine #3910

* General
** changed general.tsv to citation.csv and updated (also updated
reference to tsv in dataverse/scripts/api/datasetfields.sh)
** changed descriptions field to dsDescriptions for disambiguation
between descriptions in dataverses, datasets and files.
* Social Science:
** changed descriptions field to dsDescriptions for disambiguation
between descriptions in dataverses, datasets and files.
* Astrophysics (based on Issue #3494)
** Added new "Object" field per Gus' feedback. This should be pulled
from FITS.
** changed descriptions field to dsDescriptions for disambiguation
between descriptions in dataverses, datasets and files.
* Biomedical
** changed descriptions field to dsDescriptions for disambiguation
between descriptions in dataverses, datasets and files.