A Newcol refused because the panes' tags would not fit logs its err alone and spends no column serial

Newcol tries its column before keeping it: the new column is inserted,
the panes' rows are shared out again, and where a pane would be left
under its tag and two rows the column is taken back. The trial showed.
insertColumn logged `newcol N` and the take-back `delcol N`, so a
follower saw a column come and go around the err. Laying the column out
also gave it a serial, so the next column made skipped one. The trial is
now unannounced, since insert and drop have unlogged forms. A refusal puts
the serial counter back where it was, after first giving every existing
column its serial so the trial's is the only one spent. Only a column
that stays is logged, and it gets the next serial.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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