inline_entity_form 7.x-1.6

Inline entity form 7.x-1.6
------------------------------------
- See Inline Entity Form - Less critical - Cross Site Scripting (XSS) - SA-CONTRIB-2015-120
- Issue #2056139 by joelpittet, svenssson: Add option in setting to "Prevent adding a new entity"
- Issue #1876652 by fearlsgroove, criz: Weight delta only supports ordering of 50 items
- Issue #2218887 by joachim: Fixed missing documentation in hook_inline_entity_form_table_fields_alter().
- Issue #2343689 by fearlsgroove: Fixed Multiple forms submit/cancel closes all child forms.
- Issue #2206197 by adolfo.mansilla | jnicola: Fixed Nested Inline Entity form, issues on node creation with duplication of nested items.
- Issue #2324901 by yannickoo, axe312, marcusx: Added callback field type for theme_inline_entity_form_entity_table.
- Issue #2223005 by rszrama: Inline_entity_form_cleanup_entity_form_state() doesn't check for an instance's presence in an entity form.
- Issue #2185061: Make sanitizing entity property output in the IEF table optional
- Issue #2186553 by sender: Fix typo in inline_entity_form.api.php