Allowed content elements of fluidpages column not respected [ACL]

[cweiske]

I've got a fluidpages page layout which limits the allowed content elements in a column:

<flux:grid.column colPos="0" name="Main" colspan="3" style="width: 75%">
    <flux:form.variable name="allowedContentTypes" value="fluidcontent_content"/>
    <flux:form.variable name="Fluidcontent"
     value="{allowedContentTypes: 'Vnd.Foo:BaseContainer.html'}"
     />
</flux:grid.column>

When adding a new content element to the column with the "+ Content" button above and below elements, the list of allowed elements in the new content element wizard is filtered as it should.

However, when using the "New" item from the popup menu you get when clicking the content element icon, or when simply editing an existing toplevel element on a page - then the "Fluid Content type" drop down is not filtered.

Steps to reproduce:

1. Add new element to column on page which only allows some content elements
2. In the content element edit form the dropdown "Fluid Content type" is unfiltered.

I guess this is because fluidcontent/Classes/Provider/ContentProvider.php processTableConfiguration only checks for be groups and fluid content element children, but not for column limits.

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related to #322.