Merge branch '7.0.0' into 'master'

Pushed v7 layout for new release 7.0.0

Following are the features that are going in this release

* Vtiger 7 UI layout

* Easier list views

* Private / Public tags

* Web form attachments

* Variable Taxes, Charges and Regions

* Picklist Coloring

* App Menus

* Rollup comments

* Multiple dashboard tabs

* Controlled sharing of Lists

* Custom Activity Type

* Splitting Edit action in Create / Edit action in roles / profiles.

* Comment with attachments.

See merge request !173