Allow server-side paging

[mjacoby]

What is missing?

Currently, the client can basically request the server to send all of its data in a single request which might to in the order of GB or even TB. This might lead to high resource consumption and costs on server-side.
The reason for this is, that a client can set an arbitrary large page size or even non at all.
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How should it be fixed?

The server should be allowed to limit his response using the paging mechanism.
For example, a client might request submodels with a limit of 100 which would be ~1GB of data. The server then should be able to response with <= 100 submodels as he likes (typically this is done via fixed maximal server page size and/or maximal data size).
For the client to know that he has received less elements than requested, a server should always return the number of elements returned.
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