Revert "Merge pull request #236 from thofma/issqure"
Revert "Merge pull request #236 from thofma/issqure"

This reverts commit 653162bddb9f55d016764f2577850a911ed72cfc, reversing
changes made to ccef25ab390617f2289006f4accfbd15391af444.

thofma/Hecke.jl