Package mindep into a folder

[rht]

If mindep is an experiment (among more other experiments) on cliqs.

[Futrell]

mindep and opt_mindep are more support code for run_mindep which is the actual experiment. I'd like to keep folder structure relatively flat for this small project.

I've been thinking about reorganizing this thing into a package cliqs, with run_mindep and possibly other experiments as separate executables that import the package. This would resolve various dependency resolution issues that people have. Just so you know that is coming, and please advise if you foresee problems.

[rht]

I see, right, what I had in mind was if run_mindep could be renamed to run_exp mindep. mindep could be decoupled from the cliqs repo once there is one more cross-linguistics exp (which could be similar to mindep at first).

I'm also wondering if deptransform.py could be melded into depgraph.py (the former contains various operation utils on DepSentence), DepSentence in readcorpora.py also moved to depgraph.py[1].

This would resolve various dependency resolution issues that people have.

I could fix these -- if one of the issues are py2/py3 (so far I had encountered the issues with relative import on py3) futurize -w . should solve it, though there might be memory issues as the generators are going to be converted to lists.

(heads up incoming PRs on cliqs: parallel map fix, and caching of the corpora (as of now I have to download the dataset every time))

[1] I had been reviewing this against various existing implementations of parse tree (so far in py ecosystem, nltk.parse.dependencygraph, and spaCy's, and later on corenlp)