Allow interacted lagged controls in panel and not checking rows

[junyuan-chen]

When data do not contain any invalid rows, it's now possible to skip the checks by specifying checkrows=false with lp.

A new keyword argument wgnames for lp helps specifying lagged control variables that are interacted with panelid. Estimation does not involve building full data columns for these interacted variables, although results are numerically identical.

Fixed issues that caused wrong residuals when panelweight is specified and estimation involves 2SLS.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (abe2506) to head (07a8a43).

Additional details and impacted files

@@            Coverage Diff             @@
##              main        #8    +/-   ##
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  Coverage   100.00%   100.00%            
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  Files            7         7            
  Lines         1206      1439   +233     
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+ Hits          1206      1439   +233     

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