Use libgap for Galois groups, fix some latex errors #6144
Merged
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Currently https://beta.lmfdb.org/GaloisGroup/40T192781 times out, since Galois Groups are using the deprecated pexpect interface to gap, rather than the more modern libgap interface. Switching improves the load time (though perhaps there are more optimizations that could be done). We also fix a latex error in the conjugacy class knowl (previously, the columns of the knowl accessible by clicking on "The 1912 conjugacy class representatives for C_5^8.C_4^3.C_2^2" were not latexed).