Simplify the scancode command line options

[DennisClark]

Consider the following scancode command line options:

Options:
-c, --copyright Scan for copyrights. [default]
-l, --license Scan for licenses. [default]
-p, --package Scan for packages. [default]

I think that these are options that a scancode user will always (or nearly always) want, so I don't think the options are necessary, especially since there is no option to tell scancode that you do not want one of these, although it appears that setting another option such as "--info" seems to cancel the three [default] options out; that's just confusing.

[pombredanne]

The newest develop code post #885 now does not have ANY default at all.... so I am not sure we are going in the right direction! but on the other hand this may be addressed with config files in a different way.