This is part of #1921610: [Meta] Architect our CSS
Problem/Motivation
The comment module does not follow the guidelines in [#1089868]
Proposed resolution
comment.theme.css becomes css/comment.skin.css
comment.theme-rtl.css becomes css/comment.skin-rtl.css
In addition, since our template files are now in a templates sub-directory of a module, we should do the same for the CSS. Note that the toolbar, tour and views modules already do that.
This is part of the CSS standard described at http://drupal.org/node/1887922
Remaining tasks
This issue is blocked by #1924436: Remove separate CSS_AGGREGATE_SYSTEM aggregate file
After this issue's completion, we still have all the other steps outlined at #1921610: [Meta] Architect our CSS.
User interface changes
none
API changes
The system.module's CSS files will have new names.