Don't overwrite files by default

[phoe]

Issuing MAKE-PROJECT in a directory with an already existing and populated README.md overwrites the file. I don't think this is the intended (or expected) behavior.

[equwal]

Issuing MAKE-PROJECT in a directory with an already existing and populated README.md overwrites the file. I don't think this is the intended (or expected) behavior.

It does this for all the files. Maybe use a restart, since this strikes me as a standard "exceptional situation." You wouldn't want to accidentally delete an existing project.

Also, the current behaviour silently dirties the directory, overwriting files like README.md but leaving files outside of the template.