Support of .ppm files is realised

AlexeyAB

2018-05-17 fb9fcfb3ba0057b1196d1b95fd53cdb0b874b1c3

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classes= 20
train  = data/train_voc.txt
valid  = data/2007_test.txt
#difficult = data/difficult_2007_test.txt
names = data/voc.names
backup = backup/