Improve sview support for job arrays

Previously job arrays were only listed with their native job ID
(e.g. 123_0 listed as 123, 123_1 as 124, etc). Now lists the job ID
using both format (e.g. "123_1 (124)"). The same format is used
for job step IDs (e.g. "123_1.2 (124.2)").
Modify squeue to support longer job ID values

This is needed for job arrays with discontiguous task ID values
(e.g. "123_[1,3,5,...99999]")