Define the parameter tree for use with BaseSystem class
Methods
| clear(() -> None. Remove all items from D.) | |
| copy(() -> a shallow copy of D) | |
| fromkeys(...) | v defaults to None. | 
| get((k[,d]) -> D[k] if k in D, ...) | |
| has_key((k) -> True if D has a key k, else False) | |
| items(() -> list of D’s (key, value) pairs, ...) | |
| iteritems(() -> an iterator over the (key, ...) | |
| iterkeys(() -> an iterator over the keys of D) | |
| itervalues(...) | |
| keys(() -> list of D’s keys) | |
| pop((k[,d]) -> v, ...) | If key is not found, d is returned if given, otherwise KeyError is raised | 
| popitem(() -> (k, v), ...) | 2-tuple; but raise KeyError if D is empty. | 
| setdefault((k[,d]) -> D.get(k,d), ...) | |
| update(([E, ...) | If E present and has a .keys() method, does: for k in E: D[k] = E[k] | 
| values(() -> list of D’s values) | |
| viewitems(...) | |
| viewkeys(...) | |
| viewvalues(...) |