Improved alias handling; printing with grep;

In this release

• Improved alias handling in bant dwyu operation : more cases where aliases are used to organize location and visibility of libraries are handled.
• The print command does some basic syntax highlighting
• print now has a -g option to 'grep' for any substring. Not only the matching line is printed, but the whole surrounding rule.
• Some early stages of compilation-db creation added (though not complete and thus not working in all cases yet)