[ascii import] 1. during the import ask to update the progress bar only if we…

Authored by asemke on Oct 8 2019, 7:24 PM.

Description

[ascii import] 1. during the import ask to update the progress bar only if we have more than 1000 lines only in 1% steps 2. the import is not undo-able, no need to put column mode changes onto the undo stack

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