Gridview and DataProviders: Autoconfig sorting

[cebe]

Gridview and DataProviders can now automatically recognize colums for sorting if they are not explicitly specified.

This gets a bit more convention over configuration feeling:

• auto fill sorting colums in ActiveDataProvider if none are configured
• Lazy fallback of label creation via Inflector for Sort class (do it only in link creation method to allow setting label by other classes for example GridView)
• Refactored DataColum to use model label or specified header for sorting link label

[cebe]

should I use @inheritdoc here?

[qiangxue]

Yes, we should use @inheritdoc if possible to avoid duplicated documentation. Note I haven't used @inheritdoc until recently. So there are many places to be updated.

[coveralls]

Coverage decreased (-0.07%) when pulling 3812165 on cebe:autoconfig-sorting into ac4b875 on yiisoft:master.

[qiangxue]

Better not to modify $sort as it might be shared by other objects. We could enhance Sort::link() to support label option.

[coveralls]

Coverage increased (+0.81%) when pulling 9847472 on cebe:autoconfig-sorting into ac4b875 on yiisoft:master.

[cebe]

Okay, done here. Made all the changes as discussed.

[coveralls]

Coverage remained the same when pulling 39c002e on cebe:autoconfig-sorting into ac4b875 on yiisoft:master.

[qiangxue]

For consistency, I think it's better we make "label" part of $options rather than a separate parameter.

[cebe]

done.

[coveralls]

Coverage increased (+0.85%) when pulling 53b4ed3 on cebe:autoconfig-sorting into ac4b875 on yiisoft:master.

[qiangxue]

Thank you!