fixed bugs 47, 48, 49 and reduced complexity of dup counting as well. Now removes dirs than become empty due to duplicate removals

TODO

@@ -1,22 +1,20 @@
 ## GENERAL
-    * remove dirs after the duplicate cleanup removes all its content
-
     * Face matching:
         - upgrade to face distance per face per file [DONE]
         - face locations:
             START FORM SCRATCH for prod so all images have face_locn data
+        - need to reconsider whether current distance algorithm gives best match - can I do better?
 
     * could look to remove the hand fixing of json.loads of array data --> seems you can make your own datatype in the ORM, and it can do the conversion every time you use it
         - https://stackoverflow.com/questions/28143557/sqlalchemy-convert-column-value-back-and-forth-between-internal-and-database-fo
 
+    * per file you could select an unknown face and add it as a ref img to an existing person, or make a new person and attach?
+    * from menu, we could try to get smart/fancy... say find face with largest size, check it vs. other faces, if it matches more than say 10? we offer it up as a required ref img, then cut that face (with margin) out and use it is a new ref image / person
+
     * fix up logging in general
     * comment your code
         * js files
         * html files?
-    * more OO goodness :)
-    * viewer needs to allow toggle to scan_model (and prob. right-click on file... AI (with CNN) AI (with hog)
-        - make the form-select AI_Model actually do the change (but need more mem on mara really)
-
 ## DB	
     * Dir can have date in the DB, so we can do Oldest/Newest dirs in Folder view
 
@@ -41,15 +39,17 @@
 ### AI
     * faces per file (need a threshold for too many? OR
     * consider size of bbox of face / 'high-quality' faces -- if face is too small in image, dont match it
-    * if we have a high-qual face, we could show this on a page and have UI to create ref img / person for it
 
 ### UI
     ??? ipads can't do selections and contextMenus, do I want to re-factor to cater for this?
         - partial fix, double-click / tap allows viewing (most useful context-menu feature)
 
+    * viewer needs to allow toggle to scan_model (and prob. right-click on file... AI (with CNN) AI (with hog)
+        - make the form-select AI_Model actually do the change (but need more mem on mara really)
+
     For AI / rescan:
         way to override per file:
-            the model used
+            the model used [partial - UI done, need mem on mara]
             the threshold used?
         maybe on the per file you could select an unknown face and add it as a ref img to a existing person, or make a new person and attach?