Better table column width computing
    
    Columns can have width set or not. Without setting the width it was computed based on tbody width and number of columns. This method is working well if no column has width set. The disadvantage of this approach is that all columns have the same width and so they are not reflecting their possible usage. Flag columns such as 'external' in rule association tables or various 'enable' flags in search facets can be narrower. If we set them fixed small width it will have different size because this width is not currently added to the computation.
    
    This is fixing this problem so dynamic and fixed width can be combined and the columns have desired width.
    
    https://fedorahosted.org/freeipa/ticket/2200