Add a fast approximation for simple surveys #55
Merged
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In order to improve the run time and memory consumption we add a fast approximation for the cluster/strata/sw is NULL case.
This speeds up everything significantly. It reproduces the results of the survey package with an maximum empirical error < 0.0001 (see test file).
In addition documentation was improved.
The structure of the prevalence computation is also improved by now supporting multiple ways of computing something.