Fix issue with master pop in some cases #1071
Merged
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Found an issue where it was possible to trigger the error check on the master pop table n_neurons. The case is triggered by a pre-vertex with a splitting of atoms something like the following (a, a, a, b) where a > 2047 but b < 2047. The check was being done on b but should have been done on a. This fixes that, and adds a test to check it works, as well as adding a test to check for the maximum number of cores case.