Fix a few simple leaks inside twtest; fix some file permissions that got set wrong in last commit

src/twtest/crytpo_t.cpp

@@ -407,6 +407,8 @@ void TestCrypto()
 
     delete pPublic;
     delete pPrivate;
+    delete pPublic2;
+    delete pPrivate2;
     }
 }
 

src/twtest/fspropdisplayer_t.cpp

@@ -127,6 +127,8 @@ void cTestFSPropDisplayer::Test()
         d.TraceDebug("\n");
     }
 
+    delete pPD;
+    delete pPDNew;
 
     return;
 }

src/twtest/keyfile_t.cpp

@@ -109,6 +109,7 @@ void TestKeyFile()
         elGamal.ProcessBlock(ciphertext, recovered_text);
 
         TEST(memcmp(recovered_text, plaintext, elGamal.GetBlockSizePlain()) == 0);
+        delete [] pMem;
     }
 
     // save to and read from disk