PHPLIB-240: FindAndModify should throw for unsupported write concern #293
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https://jira.mongodb.org/browse/PHPLIB-240
This reverts the logic in 21b7d92, which was to ignore an unsupported write concern for the duration of 1.x. Since the Collection helper methods do not supply a default write concern option if it is not supported, this change will only affect users that were explicitly passing a write concern and relying on the library to ignore it.
While a minor BC break, this changes makes findAndModify consistent with other write commands.