Totally removed old ArctanRule. Renamed QDRules to ArctanRule, ArccothRule, and ArctanhRule.
Totally removed old ArctanRule. Renamed QDRules to ArctanRule, ArccothRule, and ArctanhRule.

yashsharan/sympy,rahuldan/sympy,jaimahajan1997/sympy,drufat/sympy,rahuldan/sympy,skidzo/sympy,souravsingh/sympy,postvakje/sympy,madan96/sympy,chaffra/sympy,souravsingh/sympy,drufat/sympy,jaimahajan1997/sympy,rahuldan/sympy,sampadsaha5/sympy,postvakje/sympy,sampadsaha5/sympy,souravsingh/sympy,aktech/sympy,aktech/sympy,kaushik94/sympy,madan96/sympy,jaimahajan1997/sympy,drufat/sympy,sampadsaha5/sympy,kaushik94/sympy,madan96/sympy,kaushik94/sympy,chaffra/sympy,yashsharan/sympy,yashsharan/sympy,aktech/sympy,skidzo/sympy,skidzo/sympy,chaffra/sympy,postvakje/sympy