Installer/Tester script

[jqnatividad]

DP+ is currently being containerized and that will make for an easier deployment.

Independent of that effort, DP+ should have a near bulletproof installer script that:

• check if python 3.8+ is installed
• creates the python 3.8+ venv
• downloads the required version of qsv
• creates the datapusher_jobs databases
• fetches the datastore.write_url sqlalchemy connect string from a provided ckan.ini
• creates the datapusher user in the CKAN Datastore
• confirms that the Datastore is installed and ready
• configures supervisor
• and pushes some sample CSV, TSV, Excel and ODS files
• and exercises the different DP+ options (summary stats, PII screening, etc.)

The installer script can also be called to "test/verify" an already installed DP+ at any time.