Generate a default PROJECTS_FILE

When I have lots of projects in a subgroup, I can either run the tool against all of them or I have to create PROJECTS_FILE to list the ones that I would like to scan.

It might be useful to ask the IP-CHECK tool to generate the default PROJECTS_FILE with all the ID and project names. Then we could edit this file to remove (or comment) the projects we don't want to parse.

Btw, if you implement as well the issue #2 (closed), we will be able to specify several branches we want to parse.

Does it make sense?