Hecke v0.34.7

Diff since v0.34.6

Merged pull requests:

• Add mutating arithmetic for SRows (#1659) (@lgoettgens)
• Fix @GC.preserve -> GC.@preserve (#1663) (@fingolfin)
• fix automorphism_group_generators for indefinite, ambiguous, isotropic, binary quadratic forms (#1664) (@simonbrandhorst)
• Remove comment and add new ambiguous example (#1665) (@StevellM)
• Fix bug in printing of QuadGenus (#1666) (@StevellM)
• Update license (#1667) (@paemurru)
• Don't export coprime_base_insert & subalgebra (#1668) (@fingolfin)
• Don't re-export RDF from AbstractAlgebra (#1669) (@fingolfin)
• feat: subgroup enumeration with no subgroups (#1670) (@thofma)
• feat: multiplicative dependencies for matrices (#1671) (@thofma)
• fix: expressifying empty factored elements (#1672) (@thofma)
• Mult dep2 (#1673) (@fieker)
• Don't use Flint* globals (#1674) (@lgoettgens)
• Update Hecke banner (#1675) (@paemurru)
• Fix a very important typo (#1676) (@fingolfin)
• feat: add some assertion and comment (#1679) (@thofma)
• Remove strange checkbounds method (#1680) (@fingolfin)
• chore: tag 0.36.7 (#1683) (@thofma)