first version of a spec file for freeze the app

[giumas]

Steps:

• pip install pyinstaller (if not already installed)
• go to the folder with the .spec file
• pyinstaller --clean -y GUI_Main.spec
• in the generated 'WaterColumnPlotter' folder under dict, copy AllSettingsDialog.ui to a folder named Dialogs/UIFiles

This latter step is a hack because the ui file should be collected by PyInstaller.

Once that you get the output dist folder, you can zip and redistribute it.