Update -Xlint compiler warning output

Enable output for the compiler warnings that have been eliminated so
far. 'rawtypes', 'deprecation', and 'unchecked' remain suppressed until
these warnings can be fully eliminated as well.

build.gradle

@@ -35,7 +35,26 @@ configure(allprojects) {
 	sourceCompatibility=1.5
 	targetCompatibility=1.5
 
-	[compileJava, compileTestJava]*.options*.compilerArgs = ["-Xlint:none"]
+	[compileJava, compileTestJava]*.options*.compilerArgs = [
+		"-Xlint:serial",
+		"-Xlint:varargs",
+		"-Xlint:cast",
+		"-Xlint:classfile",
+		"-Xlint:dep-ann",
+		"-Xlint:divzero",
+		"-Xlint:empty",
+		"-Xlint:finally",
+		"-Xlint:overrides",
+		"-Xlint:path",
+		"-Xlint:processing",
+		"-Xlint:static",
+		"-Xlint:try",
+		"-Xlint:-options",     // intentionally disabled
+		"-Xlint:-fallthrough", // intentionally disabled
+		"-Xlint:-rawtypes",    // TODO enable and fix warnings
+		"-Xlint:-deprecation", // TODO enable and fix warnings
+		"-Xlint:-unchecked"    // TODO enable and fix warnings
+	]
 
 	sourceSets.test.resources.srcDirs = ["src/test/resources", "src/test/java"]