added new model U-net Face Morpher.

removed AVATAR - useless model was just for demo
removed MIAEF128 - use UFM insted
removed LIAEF128YAW - use model option sort by yaw on start for any model
All models now ask some options on start.
Session options (such as target epoch, batch_size, write_preview_history etc) can be overrided by special command arg.
Converter now always ask options and no more support to define options via command line.
fix bug when ConverterMasked always used not predicted mask.
SampleGenerator now always generate samples with replicated border, exclude mask samples.
refactorings

models/ConverterBase.py

@@ -11,11 +11,12 @@ class ConverterBase(object):
     #overridable
     def __init__(self, predictor):
         self.predictor = predictor
-        
+
     #overridable
     def get_mode(self):
         #MODE_FACE calls convert_face
-        #MODE_IMAGE calls convert_image
+        #MODE_IMAGE calls convert_image without landmarks
+        #MODE_IMAGE_WITH_LANDMARKS calls convert_image with landmarks
         return ConverterBase.MODE_FACE
         
     #overridable