Add minimum risk weighting strategy to gs_design_rd and gs_power_rd#613
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Reminder to please squash and merge. Also you may add an entry to NEWS.md if you like
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The current gsDesign2 supports inverse variance and sample size weighting strategies, in stratified group sequential design for risk difference.
This PR is to add minimal risk weighting strategy to the
gs_power_rd,gs_design_rdandgs_info_rd, following the testing method proposed in Mehrotra, Devan V., and Radha Railkar. "Minimum risk weights for comparing treatments in stratified binomial trials." Statistics in Medicine 19.6 (2000): 811-825.