sketch of Runtime.exec() and Calendar; misc bugfixes

classpath/java/lang/Process.java

@@ -0,0 +1,18 @@
+package java.lang;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public abstract class Process {
+  public abstract void destroy();
+
+  public abstract int exitValue();
+
+  public abstract InputStream getInputStream();
+
+  public abstract OutputStream getOutputStream();
+
+  public abstract InputStream getErrorStream();
+
+  public abstract int waitFor() throws InterruptedException;
+}