Directories to exclude dialog box should be longer.

[tlhonmey]

When running the program interactively, the dialogue box which asks for the list of things to exclude from the backup only has the small amount of space visible on the screen available for entering them. This is a problem if one has several directories to exclude, or ones with long names. Either the length of the input box should be expanded, or it should be made to prompt multiple times. The ability to give it a file with a list of directories to exclude could work as well, but that might become confusing.

[Bruno Cornec]

Look #3