Extended the automated script for cases in which the input directory is not pre-set.

* [SCRIPT_EXT,SC] Made script stage a bit more modular by adding methods for retrieving the from and to arguments (directory or file).
* [SCRIPT_EXT,EXT] Ask the use for the input file, if it is not located in the input directory.
* [USER_INPUT,NEW] Added user_input_directory/2 for asking the user to enter the directory for a known file name.