Isoltets SMTChecker option and BMC specific tests

test/libsolidity/smtCheckerTests/bmc_coverage/assert.sol

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+pragma experimental SMTChecker;
+contract C {
+	function f(uint x) public pure {
+		assert(x > 0);
+	}
+	function g(uint x) public pure {
+		require(x >= 0);
+	}
+	function h(uint x) public pure {
+		require(x == 2);
+		require(x != 2);
+	}
+	function i(uint x) public pure {
+		if (false) {
+			if (x != 2) {
+			}
+		}
+	}
+}
+// ====
+// SMTEngine: bmc
+// ----
+// Warning 4661: (81-94): BMC: Assertion violation happens here.
+// Warning 6838: (143-149): BMC: Condition is always true.
+// Warning 6838: (218-224): BMC: Condition is always false.
+// Warning 2512: (286-292): BMC: Condition unreachable.

test/libsolidity/smtCheckerTests/bmc_coverage/funds.sol

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+pragma experimental SMTChecker;
+contract C {
+	function f(address payable a) public {
+		a.transfer(200);
+	}
+}
+// ====
+// SMTEngine: bmc
+// ----
+// Warning 1236: (87-102): BMC: Insufficient funds happens here.

test/libsolidity/smtCheckerTests/bmc_coverage/math.sol

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+pragma experimental SMTChecker;
+contract C {
+	uint z = 1;
+	uint w = z - 3;
+	function a(uint x, uint y) public pure returns (uint) {
+		return x + y;
+	}
+	function s(uint x, uint y) public pure returns (uint) {
+		return x - y;
+	}
+	function m(uint x, uint y) public pure returns (uint) {
+		return x * y;
+	}
+	function d(uint x, uint y) public pure returns (uint) {
+		return x / y;
+	}
+}
+// ====
+// SMTEngine: bmc
+// ----
+// Warning 2661: (141-146): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
+// Warning 4144: (217-222): BMC: Underflow (resulting value less than 0) happens here.
+// Warning 2661: (293-298): BMC: Overflow (resulting value larger than 2**256 - 1) happens here.
+// Warning 3046: (369-374): BMC: Division by zero happens here.
+// Warning 6084: (68-73): BMC: Underflow (resulting value less than 0) happens here.