Added index in DFTable

[tavisit]

No description provided.

[tavisit]

Results, backwards compatible:

[codecov-commenter]

Codecov Report

Merging #118 (43c098c) into master (4303110) will increase coverage by 0.10%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   76.56%   76.66%   +0.10%     
==========================================
  Files         225      225              
  Lines        8953     8953              
==========================================
+ Hits         6855     6864       +9     
+ Misses       2098     2089       -9     

see 1 file with indirect coverage changes

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