Merge branch features to Plomino 2

[ivanteoh]

• [ ] #632 ([WIP] Group fields and return field ids with validation errors) Now the PlominoForm is dexterity container.
• [ ] #675 (Fix date validate) Now the date field is text box.
• [ ] #646 (Fix getHidewhenAsJSON) As hidewhen feature is not implemented yet.
• [ ] #644 (Add check for hidden subforms) As hidewhen feature is not implemented yet.
• [ ] #656 (Fix #652 Datagrid has js error)
• [ ] #673 (Dynamic display fields)
• [ ] #642 (Display page forms in read mode)
• [ ] #651 (Search view with nocall)
• [ ] #630 (Fix #625 displayDocument()) - pull request #721