Note: the hardcoding in this patch is only for the 2.2 hotfix branch; in
the 2.3 branch we will only have to change the default setting for the
typechecker.
This is to set up improvements to the cryptol-server, and therefore
pycryptol interface.
This patch also fixes a regression in pretty-printing output caused by a
previous error in fixity of the `<>` operator
Revised how we do output for `:sat` and `:prove` without arguments,
making it more clear what properties are being checked in each case.
Also reworded the output of `:check` slightly in the case where the
property has no inputs. It would be nice to make `:check` output more
consistent with the others.
