Initial release of 'gxadmin' tool

We have recently released a small utility we use for helping manage our Galaxy server. It is available on GitHub and includes many small SQL queries that administrators run every day.

As a Galaxy administrator, you can use it to do things like viewing the queue:

$ gxadmin query queue
                            tool_id                                |  state  | count
-------------------------------------------------------------------+---------+-------
 toolshed.g2.bx.psu.edu/repos/iuc/unicycler/unicycler/0.4.6.0      | queued  |     9
 toolshed.g2.bx.psu.edu/repos/iuc/dexseq/dexseq_count/1.24.0.0     | running |     7
 toolshed.g2.bx.psu.edu/repos/nml/spades/spades/1.2                | queued  |     6
 ebi_sra_main                                                      | running |     6
 toolshed.g2.bx.psu.edu/repos/iuc/trinity/trinity/2.8.3            | queued  |     5

amongst many more queries. We hope that other administrators will find this utility useful and can contribute queries that they run often.