[FIX] Disable dynamic signals where applicable

[ales-erjavec]

Issue

Ref: #7043

CSV Import in particular should not have declared dynamic output.

Description of changes

Disable dynamic outputs where applicable.

Includes

• Code changes
• Tests
• Documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.61%. Comparing base (afc6c18) to head (f0fe384).
Report is 64 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7045      +/-   ##
==========================================
- Coverage   88.62%   88.61%   -0.01%     
==========================================
  Files         332      332              
  Lines       73365    73365              
==========================================
- Hits        65019    65015       -4     
- Misses       8346     8350       +4     

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[ajdapretnar]

This one I'm unsure of. Could I not merge two corpora? I do this often (append metadata to a corpus).

[ales-erjavec]

From what I can gather this will always create a plain Table
https://github.com/biolab/orange3/blob/3.38.1/Orange/widgets/data/owmergedata.py#L630-L632

        table = Orange.data.Table.from_numpy(domain, X, Y, metas)
        table.name = getattr(self.data, 'name', '')
        table.attributes = getattr(self.data, 'attributes', {})

[ajdapretnar]

Right, we might have discussed this with Primož at some point and agreed it should be a Table.