Checking function when making directory

[Ikki Tanaka]

Now data directories(i.e., data/input(output)/...) are made in importing stacking if the directories does not exist.
But if this is simply implemented, user can make directories without intent.
It is useful that one can select if making them in the first import.

like:

Can new directories for input and output data be created? [Y/n]
Y(N) <---- input