Expose the dependencies on the project page

This will be most relevant to drupal.org (or websites where the projects are actually Drupal modules). Basically it would be a good idea to have:

• a list of modules that are required to be installed in order to use a module (the "dependencies"),
• a list of modules that require a particular module (the "dependants"),
• a list of modules that "somehow interacts" with a module (that is, "optional dependencies").

All this data besides the optional dependencies are already stored in the .info files, we just need to pull them out and store it in the database. Right now the maintainers use regular webpages for this, which can get unwieldy at times (e.g. http://groups.drupal.org/rules/rules-modules ), not to mention the extra clerical work needed to maintain such a list.

There are many benefits of having this data available, such as having a better grasp of the popularity of a module, and just to see how modules in Drupal all work together. (A simple look at the dependants of Views module will be able to tell us how much it can be extendable.)

For the interface, a simple list like http://www.archlinux.org/packages/extra/x86_64/cups/ should be nice enough. (Optional modules can be just marked as "optional", with some remarks of why they are so.)

Also if this data is made public it can be used by utilities such as drush to automatically download necessary dependencies.