tetra should add the License files to the rpm

[mcalmer]

Any license file which can be detected by tetra should be added to the RPM package.
Adding

%doc LICENSE.txt

to the filelist in the specfile would be enough.

[mcalmer]

We need a mechanism to find all kind of license files and names including the full path starting inside of the src/ directory created by tetra.

• license
• copying
• copyright

are names we should search for case-insensitive.

%doc