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bugfix: ensure create_column always appends to Surface

This requires commands that create columns to provide helpers that populate them.

scenario: unroll a column, quit, restart

Before this commit the unrolled column seemed to disappear. In reality it was just getting pushed back by single-file columns that were inserting after cursor rather than appending.

Created by  Kartik K. Agaram  on August 9, 2022
CMGIWHDA5EQY22VK7GJMDMCONMVYKJ7HCB6QISHTMVZGUBIPAYFQC
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