Drop "-sourceFiles" in kotlinc-js

Use free arguments instead, as is done in kotlinc-jvm and all sensible
compilers everywhere

Also fix some cases of AntTaskTest to be able to run them locally

compiler/cli/cli-common/src/org/jetbrains/jet/cli/common/arguments/K2JSCompilerArguments.java

@@ -35,10 +35,6 @@ public class K2JSCompilerArguments extends CommonCompilerArguments {
     @ValueDescription("<path[,]>")
     public String[] libraryFiles;
 
-    @Argument(value = "sourceFiles", description = "Source files or directories separated by commas")
-    @ValueDescription("<path[,]>")
-    public String[] sourceFiles;
-
     @Argument(value = "sourcemap", description = "Generate SourceMap")
     public boolean sourcemap;
 

compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompiler.java

@@ -76,13 +76,13 @@ public class K2JSCompiler extends CLICompiler<K2JSCompilerArguments> {
             @NotNull MessageCollector messageCollector,
             @NotNull Disposable rootDisposable
     ) {
-        if (arguments.sourceFiles == null) {
-            messageCollector.report(CompilerMessageSeverity.ERROR, "Specify sources location via -sourceFiles", NO_LOCATION);
+        if (arguments.freeArgs.isEmpty()) {
+            messageCollector.report(CompilerMessageSeverity.ERROR, "Specify at least one source file or directory", NO_LOCATION);
             return ExitCode.INTERNAL_ERROR;
         }
 
         CompilerConfiguration configuration = new CompilerConfiguration();
-        configuration.addAll(CommonConfigurationKeys.SOURCE_ROOTS_KEY, Arrays.asList(arguments.sourceFiles));
+        configuration.addAll(CommonConfigurationKeys.SOURCE_ROOTS_KEY, arguments.freeArgs);
         JetCoreEnvironment environmentForJS = JetCoreEnvironment.createForProduction(rootDisposable, configuration);
 
         Project project = environmentForJS.getProject();