Dvha

* MAJOR restructuring with majority of main.py moved into bokeh_components directory
* Next release will begin working on better efficiency
* Residual chart added to Regression tab, will develop into Control Chart
* Begin making code more concise using classes and dictionaries
* Issue 42 - Regression drop-downs not updating properly when deleting/changing EP
* MLC Analyzer does not cause crash if DICOM plan file cannot be found

* typo in keyword for parameter in dicom_to_sql (import_latest_plan_only changes to import_latest_only)
* Shapely speedups enabled, if available
* Shapely has calcs available in C, as opposed to C++
* centroid, dist_to_ptv_centroids, dth (distance to target histogram), spread_x, spread_y, spread_z, cross_section_max,
cross_section_median, columns added to DVHs
* These columns can be added by clicking Create Tables from Settings view, if running from source
* Running from Docker or pip install shouldn't need to do this manually
* dist_to_ptv_centroids and dth must be calculated from Admin view after proper ROI name mapping
* dth_string calculated with Calc PTV Dist in Admin view
* the string stored is csv representing a histogram with 0.1mm bins
* centroid, spread, and cross-sections also calculated at time of import
* calc in Admin view only required for data imported prior to 0.4.4 install
* Admin view now specifies Post-Import calculations via dropdown
* Added choice "Default Post-Import" to run through all calcs not done at time of DICOM import
* Endpoints for review DVH now calculated

* Minor tweaks for on compliance with DICOM files from http://www.cancerimagingarchive.net/
* Move Files Check box added in admin view if user wishes to keep files in the inbox

* Minor tweak to check for TPS Vendor tags prior to accessing, working on compliance with DICOM files from
http://www.cancerimagingarchive.net/

* IMPORT_LATEST_ONLY removed from options.py in lieu of a simple checkbox in the admin view.
* Settings view now has functionality to edit parameters in options.py. These edits are stored
in preferences/options via pickle. If preferences/options does not exist, the default values in
options.py are used.
* Draft of a user manual is now available.