improve flexiblity of IOdictionary construction, use of ITstream, Function1

• simplify/improve use of ITstream as a string parser/scanner
• consolidate handling of fallback IOdictionary content to reduce code
• extend some Function1/PatchFunction1 to accept dictionary input.

Alltest without any failures.

reviewed/discussed - looks good

approved this merge request

mentioned in commit bfea2326

merged