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[client, providers] Now import the schema from the server, with an integrity checking for optimisation

The method getFromCardinality was used instead of getToCardinality.
This used to work because there was no difference between the two previously ...

The cardinality information is read from a cardinality string, e.g. "?*".
There are two methods, getFromCardinality and getToCardinality to read the
cardinality for the subject and range/target, respectively, of the relation.
However the two methods were the same, both reading the first character.

In cardinality strings the first character correspond to the range/target of the
relation and the second to the subject/origin. Therefore, this changeset fixes
the getFromCardinality method to read its data from the second character of the
cardinality string.