Add auto update and email on announced or normal-archived job

[patrikas-git]

This PR also:

• Removes some methods for Stats2 which were unused.
• Renames docs from using Stats2 to Reqmgr2 to not mislead.
• Removes and repurposes not working job added in Integration of RelVal Status Stream Monitoring and Notification System #64
• Removes Update button which doesn't do anything in the Workflows column (the "Update workflow" button should be used instead in Actions column, or at the bottom of the page when a Relval is checked)
• Adds some classes and files for concern separation, e.g. application/db.py instead of using Database, which I find to be inflexible to have a wrapper around MongoClient; ReqmgrClient which uses requests lib directly instead of using ConnectionWrapper, which is also inflexible and using requests directly seems like a better idea.
• Refactors Dashboard update service from static method to normal method and specifies tmp file path in config.cfg file
• Removes excessive logging in controller_base.py class

Let me know if there are any suggestions for file and class names.

This is what the email sent may look like: