Improve resizing column of Metadata - Products/Workflows/Tasks

[wouter1975]

Resizing the column of these table is not working optimal. In these table when move the border of the column the final re-render of the border of the column is not at the same place.

The column typically becomes too wide. For example when decreasing the width of the column by 50%, the end result is 80%.
Or when increasing the width to say 120% the final width become 150%.

• Probable fix to change all columns to fixed px width.
• Length calculation can be removed from the code (Ruben)

[wouter1975]

@DutchBen, I guess these table are still using the earlier implementation, as I have seen this behavior when testing the initial versions.