Is it possible to get the number of datapoint configs in an easy way?

To get the information how many configs the current project has there is an easy way to find out.

Open the System Management -> Diagnostics -> Event Manager Connections.

In that panel you can click on the various managers to find out which configs are currently loaded by these managers.
1) The Data Manager has the information for the _archive configs. The number of _archive configs does not give the information if they are set active or inactive.
2) A driver has the information for the _address, _cmd_conv, _msg_conv and _smooth configs. The number of _address configs does not give the information if they are set active or inactive. Therefore this number is not the number of I/Os counted for the license.
3) The Event Manager has the information for all the other configs.

You can get the same information with the debug flag "-report configmanager". The information is written to the manager specific log file.
The debug flag can be used for the Data Manager, the Event Manager and all drivers.