Modify view() function to accept an execution id, not package id

[Peter Slaughter]

The listRuns() out displays a "run identifier" and a "package identifier". The user can view detailed
info about a package for a run by passing the "package identifier" to the view() function.

Having multiple ids to describe a run may be confusing to users, so the view() function will be modified to accept a "run identifier" and will display info for the package(s) associated with that run.

This was discussed/decided here: https://epad.nceas.ucsb.edu/p/20141107-commdyn

[Peter Slaughter]

Implemented in commit 8de9481