[ENH] Simplify conversion of Table to DataFrame

[JakaKokosar]

Issue

Description of changes

Includes

• Code changes
• Tests
• Documentation

[codecov-commenter]

Codecov Report

Merging #44 (fb4c9e1) into master (6923e30) will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   45.76%   45.68%   -0.08%     
==========================================
  Files          12       12              
  Lines        1180     1182       +2     
==========================================
  Hits          540      540              
- Misses        640      642       +2     

Impacted Files	Coverage Δ
orangecontrib/survival_analysis/modeling/cox.py	0.00% <0.00%> (ø)
...urvival_analysis/widgets/owranksurvivalfeatures.py	0.00% <0.00%> (ø)
...rvival_analysis/widgets/owstepwisecoxregression.py	0.00% <0.00%> (ø)

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