More, subtler fallout of the ABI patchset: When mechanisms are added to empty regions, various, layered segfaults appear. 1. `set_parameter` will receive a `nullptr` upon linear search, throwing `no such parameter` 2. Guarding this for finite `width` uncovers further need in the ABI interface methods 3. This is caused by early exit in `instantiate` on `width == 0` 4. Getting rid of this is better, as we can treat vacuous mechanism painting like all others... 5. ...but causes another segfault, since we default index arrays to `cv_pos.back()` but `cv_pos` is empty. This patch fixes all of the above and in addition removes mechanisms without support before reifying them on the FVM cells. Relevant tests are added.
Arbor is a library for implementing performance portable network simulations of multi-compartment neuron models.
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