General improvements to input/output errors#491

Merged

dpvc merged 3 commits intodevelopfrom better-errors

Jun 16, 2020

+33-6

Commits on May 13, 2020

Format output errors better. Make input/output errors have a tooltip for the error message, and the same for NoErrors output. Save error messages in input/output data in the MathItem.
dpvc
committed

Commits on Jun 16, 2020