Fix Metadata Propagation with Overridden Pandas Methods

[westernguy2]

Overview

Currently the Pandas methods that are being overridden (head, tail, describe) are changing the history for the original DataFrame, instead of the newly created one. This PR fixes that issue.

Changes

The PR moves changes the metadata of the DataFrame returned as a result of the Pandas operation. It also removes method that extends info since info doesn't return a DataFrame. The PR also ensures that the _pandas_only flag works in _ipython_display_ by re-adding the else clause that was commented out.

Example Output

The bug where two DataFrames would be outputted as a result of the lines:

df.info()
df

was what flagged this issue, and this is now fixed.

[codecov]

Codecov Report

Merging #332 (1e33fbc) into master (2525d71) will increase coverage by 0.18%.
The diff coverage is 86.11%.

❗ Current head 1e33fbc differs from pull request most recent head 1cddd26. Consider uploading reports for the commit 1cddd26 to get more accurate results

@@            Coverage Diff             @@
##           master     #332      +/-   ##
==========================================
+ Coverage   79.90%   80.09%   +0.18%     
==========================================
  Files          50       50              
  Lines        3613     3612       -1     
==========================================
+ Hits         2887     2893       +6     
+ Misses        726      719       -7     

Impacted Files	Coverage Δ
lux/core/frame.py	70.82% <86.11%> (+0.57%)	⬆️
lux/vislib/matplotlib/ScatterChart.py	76.47% <0.00%> (+1.17%)	⬆️
lux/vislib/matplotlib/Heatmap.py	98.33% <0.00%> (+1.66%)	⬆️
lux/vislib/altair/ScatterChart.py	96.96% <0.00%> (+3.03%)	⬆️
lux/vislib/altair/Heatmap.py	96.55% <0.00%> (+3.44%)	⬆️

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