WIP: Allow non-contiguous subgroups for synapses #805

Job	Run time
Determine Python versions	7s
Run linters with pre-commit	1m 9s
Test building the documentation	2m 44s
Python 3.12 on ubuntu-20.04 (standalone: false, 32bit: false)	37m 33s
Python 3.12 on ubuntu-20.04 (standalone: false, 32bit: true)	50m 31s
Python 3.12 on ubuntu-20.04 (standalone: true, 32bit: false)	42m 31s
Python 3.12 on ubuntu-20.04 (standalone: true, 32bit: true)	40m 19s
Python 3.12 on windows-2019 (standalone: false, 32bit: false)	1h 18m 1s
Python 3.12 on windows-2019 (standalone: false, 32bit: true)	1h 7m 36s
Python 3.12 on windows-2019 (standalone: true, 32bit: false)	37m 52s
Python 3.12 on windows-2019 (standalone: true, 32bit: true)	24m 55s
Python 3.12 on macOS-11 (standalone: false, 32bit: false)	51m 36s
Python 3.12 on macOS-11 (standalone: false, 32bit: true)	50m 44s
Python 3.12 on macOS-11 (standalone: true, 32bit: false)	32m 33s
Python 3.12 on macOS-11 (standalone: true, 32bit: true)	30m 54s
Python 3.9 on ubuntu-20.04 (standalone: false, 32bit: false)	39m 29s
Python 3.9 on ubuntu-20.04 (standalone: true, 32bit: false)	41m 7s
Indicate completion to coveralls.io	0s
	10h 29m 41s

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