Enable autoconversion for columns

[numeredev]

SUMMARY

Implements necessary changes for #67

Reviewers: @numere-org/maintainers

IMPLEMENTATION

• Implementation: Implemented by adding the "auto" type specifier for TAB().convert()
• Implementation test: Created a table with time values encoded as strings. TAB().convert() correctly detected the datetime type as best fitting auto conversion and applied that

DOCUMENTATION

• [x] ChangesLog updated
• [x] Code changes commented
• Documentation articles:
  • [x] corresponding documentation articles updated
  • [ ] new documentation articles created
  • [ ] not needed
• Language files:
  • [x] corresponding language files updated
  • [ ] not needed

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TESTS BY REVIEWERS

• [x] Added to the automatic SW tests
• [x] Tested manually