Fix create_db problem
Typo in docs
Removed deprecated style declarations
Add detail and clarifications to syncdb/migrate
Add Fabric commands drop_db and upgrade
Fabric update_db fixes

_migrate_fake for initial `migrate --fake 0001` for 2.5->2.5.1 conversion
(but only if it is still needed!)

Eliminate extra settings(hide(...)) unneeded for setup_db/update_db
Add working version of update_staging script

Apart from being an example of copying one deployment to another, this also
provides an example of using Fabric commands for performing a Pootle upgrade.