an user can now be disabled or expired.
If you are using an SQL database as dataprovider please remember to
execute the sql update script inside "sql" folder.
Fixes#57
* created a "Log" function for type "Connection"
* created a "log" function for type "Provider"
* replace logger calls to Log/log where possible
I also renamed PGSSQL to PGSQL, as this seemed to be a typo
Signed-off-by: Jo Vandeginste <Jo.Vandeginste@kuleuven.be>