Code style cleanup

I processed the source with Coder and updated the layout of the .install file.

The highlights: It removes the obsolete hook_help() that was used before .info files provided the module description on the modules page, switches update functions to use schema api, removes trailing whitespaces, and adds @file docblocks according to webchick's guidelines in #263956: Ye Grande Olde Drupal 7 .install File Cleanup.