Enh #1928: Gii is now able to use table columns' comments as the attribute labels of a new generated model.
Enhancements to the #2277.

1. Change log line fixed.
2. Attribute names fallback mode: column comments are preferred over column names.
3. Related view altered.
Checkbox state checking forgotten.
Merge pull request #2277 from resurtm/gii-column-comments-as-labels

Enh #1928: Gii is now able to use table columns' comments as the attribute labels of a new generated model.