Remove SRP6 file support

It turns out SRP6 files use a different base64 alphabet than standard,
and additionally Botan's decoding of the group id seems wrong though
I haven't verified this second was a bug. In any case this code couldn't
parse anything it was supposed to and never could.

I had already planned on adding a database backed SRP store and removing
this code but the fact that it's actually not functional for purpose
suggests it's best to remove this now rather than let someone chance upon
it and be endlessly frustrated that it doesn't seem to work because all
the verifiers are garbled.

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