Adding simple array copying tests

test/libsolidity/semanticTests/array/array_copy_memory_to_storage.sol

@@ -0,0 +1,11 @@
+contract C {
+    uint[] a;
+    function f() public returns (uint, uint) {
+        uint[] memory b = new uint[](3);
+        b[0] = 1;
+        a = b;
+        return (a[0], a.length);
+    }
+}
+// ----
+// f() -> 1, 3

test/libsolidity/semanticTests/array/array_copy_storage_to_memory.sol

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+contract C {
+    uint[] a;
+    function f() public returns (uint, uint) {
+        a.push(1); a.push(0); a.push(0);
+        uint[] memory b = a;
+        return (b[0], b.length);
+    }
+}
+// ----
+// f() -> 1, 3

test/libsolidity/semanticTests/array/bytes_memory_to_storage.sol

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+contract C {
+  bytes s;
+  function f() external returns (byte) {
+    bytes memory data = "abcd";
+    s = data;
+    return s[0];
+  }
+}
+// ----
+// f() -> "a"

test/libsolidity/semanticTests/array/bytes_storage_to_memory.sol

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+contract C {
+  bytes s = "abcd";
+  function f() external returns (byte) {
+    bytes memory data = s;
+    return data[0];
+  }
+}
+// ----
+// f() -> "a"

test/libsolidity/semanticTests/calldata/calldata_bytes_to_storage.sol

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+contract C {
+  bytes s;
+  function f(bytes calldata data) external returns (byte) {
+    s = data;
+    return s[0];
+  }
+}
+// ----
+// f(bytes): 0x20, 0x08, "abcdefgh" -> "a"