Changing a column in the info table takes long.

[dan-slater]

Info table currently assembled from dataitems. This makes changing the info table values take long and this time is added to the mapping execution time of the dataset.

[dan-slater]

The current system of assembling the info table and treating it as a property of the DataSet is too complicated. One cannot do things like ds.info_table['a']' = a. This would have to be done in multiple lines. Will need to go back to treating the info table as a simple instance attribute.