Fix the "levels" value for the local namespace
Move the support for multiple code blocks further down the line (into translate_statement_sequence). For C++ code, SUPPORT_CODE, POINTERS, etc. have to be handled for all blocks (the variables/functions used might be different or the same)
Fix the lumped_variable template for C++ and make sure it is included in the test suite
Do not resize scalar delays when adding synapses
Performance improvement for handling subgroups in push_spikes using bisect.