Admin panels should honor default date and time format Options

[MichaelH]

Any administrative panel displays of posts, pages, and comments should honor the default date and time formats set by users in Options->General.

[MichaelH]

Changes 4 panels to use default date and time settings

[MichaelH]

Patch makes four admin panels adhere to Options General date and time format settings.

1. wp-admin/admin-functions.php

2. wp-admin/edit-comments.php

3. wp-admin/edit.php

4. wp-admin/moderation.php

[matt]

The internal date formats in the admin were chosen for reasons in different places, I don't think we should use that setting.