Add ability for getjobinfo to pull specific tags from job logs

[NucciTheBoss]

Currently, getjobinfo pulls the whole XML log when querying a specific job id, however, sometimes you're really only looking for the job script. Therefore, getjobinfo should have the ability to pull specific tags from the logs.

Might look like something like the following: getjobinfo tag -n <...> - will need to enable getjobinfo to be called without needing a sub-command to be invoked. @click.group(invoke_without_command=True) should do the trick.