Improve documentation lookup command

[psynaptic]

I noticed the "Documentation for word" command doesn't work for theme functions. I'm not sure how we would solve this.

Example: MODULE_links or THEME_links lookup fails because it's looking for a hook. We need to replace prefix with theme_ or hook_ as necessary but we don't really have any criteria to set of a condition.

[webflo]

hook is hook and theme is theme.

MODULE_links implements hook_links. THEME_links implements theme_links. There is no problem. We need no prefix replacement.

We should add all theming functions and use the "Documentation for word" for completion and a tab tigger commands for printing. As we have already done it for the hooks.

[psynaptic]

Except that theme functions can be overridden in a module too. So it could be EXAMPLE_links (where the lookup would be theme_links) or EXAMPLE_init (where the lookup would be hook_init).

If we have all theme functions in the module then sure, we have the criteria for the condition. Maybe we should generate the hooks using drupalcontrib.org?