Pyontutils

ttlser-1.0.0

ttlser` memory usage and performance [improvements](https://github.com/tgbugs/pyontutils/commit/c07d33089039888be3f191197d355ae8d76029a9).

Ontology content code reorganized into discrete submodules for `methods`, `neurons`, and `parcellation`.

First GitHub release. Minor reorganization and bugfixes.