Synonym-dict

Nonspecific child compartments submitted to `CompartmentManager.__getitem__` can be bypassed.
I think we are getting close to 0.2.0 here!

- `post0` (2021-02-24) Major performance improvement on `SynonymSet.__contains__`

Bug fixes: patch a recursion bomb, leaky subcompartments. 'attach' method for avoiding lineage
conflicts.

- `.post0` - test code changes for ease of subclassing

Add CAS number detection to Flowables.add_synonym(). Previously it had only worked on new_entry.

Don't check every query for NONSPECIFIC_LOWER.

Now, it's debatable that the right solution here is to actually have the null_entry _be_ an entry, whose synonyms
are exactly the NONSPECIFIC terms. After all, isn't the whole point of this to return specific entries for specific
query terms? But for WHATEVER reason I took steps to prevent the null_entry from having any other terms besides
'None', and I hate to second-guess myself. But please note that this issue should perhaps be revisited.

When compartments are presented as lists, parent names added for disambiguation should be stripped back out.

Typical rookie errors in first-ever PyPI upload