Change "insane" to "absurd" (referring to high fees) in text strings and identifiers.

Note that this will also require translation changes in Transifex for the key
"A fee higher than %1 is considered an insanely high fee." which is now
"A fee higher than %1 is considered an absurdly high fee."

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

src/main.h

@@ -205,7 +205,7 @@ void FlushStateToDisk();
 
 /** (try to) add transaction to memory pool **/
 bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransaction &tx, bool fLimitFree,
-                        bool* pfMissingInputs, bool fRejectInsaneFee=false);
+                        bool* pfMissingInputs, bool fRejectAbsurdFee=false);
 
 
 struct CNodeStateStats {