alias dir for consistency in the website

maybe move all web dirs in misc.py to usui?
Merge branch 'master' into rename-dir-path
Merge branch 'master' into rename-dir-path
saving default ytransform as '' instead of null
checking in some intermediate changes testing new simulation framework
changes to yamlmodelrunner for new dataset style
small changes after looking at diff

yamlmodelrunner needs to be moved and import time at the top
when adding rows, need to be able to get only the local columns
small change - only keep local columns in transition model
performance bug in yamlmodelrunner

marking agents to relocate with np.nan is a big performance issue.  I think this forces the type to float and then calling .loc with a float is a major performance issue.  Moving this back to marking relocating agents with -1 fixes the problem for now.  This might need a more permanent fix.

Also there was a warning in sqftproforma that needed to be addressed
fixing some important bugs in yamlmodelrunner

need to remove nans before sampling

-1 now marks relocating agents
Transition model changes to handle agent segments of length zero
Merge pull request #62 from synthicity/transition-ej

Transition model- handle agent segments of length zero and certain control total conventions
Remove "even_rents.png" file after running sqftproforma debug test.
PEP8 fix.
Fix some developer docstrings and add to sphinx docs.

[ci skip]
Add sim framework to sphinx docs

[ci skip]
Merge pull request #64 from synthicity/doc-update

Doc update

Add sim and developer sub-packages to the Sphinx docs.
Function for mapping column names to the tables that contain them.
Function for registering table merges as broadcasts of one onto the other.