issue #22: fixes for deployment to Heroku

[rngadam]

Fixes:

• add insertion of clients as organization in import
• remove some of the DROP...CASCADE
• rewrite to simplify report.organization
• disable extensions that are not available on Heroku postgresql

[xuyuji9000]

We don't delete branch, after it is successfully merged?

[rngadam]

@xuyuji9000 I generally don't bother to. if anything, I want people to see examples of how to properly name their branches.