code.dlang.org now supports categories and search - license information now required

[Sönke Ludwig]

There has been another important change that requires existing packages 
to be updated: All packages must now have the fields "description" and 
"license" present to be published. The license field has to be set 
according to the specification [1]. All existing branches and version 
tags stay unaffected by this requirement and are still available.

This change has been done to prepare for an automated validation of 
license terms in complex dependency hierarchies. This may be an 
important feature as the number of available packages grows, which is 
why this requirement has been introduced now as early as possible.

[1]: http://code.dlang.org/package-format#licenses