fix my own silliness in provers-data.conf + remove bogus prelude from tptp.drv

drivers/tptp.drv

-(* Why driver for tptp first-order logic solvers *)
-
-prelude "% this is a why prelude for tptp solvers
-fof(two_constants, axiom, ~ ('0' = '1'))."
+(* Why driver for first-order tptp provers *)
 
 printer "tptp"
 filename "%f-%t-%g.p"

share/provers-detection-data.conf

@@ -62,7 +62,7 @@ driver = "drivers/simplify.drv"
 [ATP spass]
 name = "Spass"
 exec = "SPASS"
-version_switch = "|| false"
+version_switch = "-TPTP || true"
 version_regexp = "SPASS V \\([^ \n\t]+\\)"
 command = "why3-cpulimit 0 %m %e -TPTP -PGiven=0 -PProblem=0 -DocProof -TimeLimit=%t %f 2>&1"
 driver = "drivers/tptp.drv"

theories/algebra.why

@@ -69,6 +69,7 @@ theory UnitaryCommutativeRing
   clone export CommutativeRing
   logic one : t
   axiom Unitary : forall x:t. one * x = x
+  axiom NonTrivialRing : zero <> one
 end
 
 theory Field