Functionalizer

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Changes:
- Ensure that properties drawn from a truncated gaussian are always
positive: truncate the normal distribution at ±1σ and 0.

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Changes:
- Fix random number generation for determining active connections

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Changes:
- Support post- and pre- neuron ordering of the output.
- Reordering of the command line options and help

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Changes:
- Fix the morphology output to use floats consistently
- Add ability to process morphologies stored in nested directories

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Changes:
- Switched to new unique seeding for random numbers: **breaks
backwards-compatibility on a bitwise comparison**
- Improved `gap-junctions` support:
* unique junction ID ready to consume by Neurodamus
* added bi-directionality to dendro-somatic touches

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Changes:
- Initial support for gap-junctions
- Control filters run with `--filters` command-line option
- One of `--structural`, `--functional`, or `--gap-junctions` has to be
passed to the executable to define filters
- Save neuron ids as 64 bit integers in the final export
- Add the following information to `report.json`:
* the largest shuffle size
* the number of rows seen last
* the largest number of rows seen
- Documented filters

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Changes:
- Read the layers from circuit files rather than inferring them from
morphologies