Get npoints for all transients in single query

Addresses #4234.
Include frequency in source table

Addresses #4239.
Include num images in dataset listing
Add band info to transient display
Merge pull request #26 from jdswinbank/iss4234

Get npoints for all transients in single query
Merge pull request #27 from jdswinbank/iss4239

Include frequency in source table
Merge pull request #28 from jdswinbank/iss3341

Include number of images in dataset listing