Replace RXTX-based serial library by one based on JSSC

Development on this was done in https://github.com/gohai/processing-serial-jssc. See also https://github.com/gohai/java-simple-serial-connector for changes to JSSC (not yet upstreamed).

java/libraries/serial/.classpath

@@ -2,7 +2,7 @@
 <classpath>
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
-	<classpathentry kind="lib" path="library/RXTXcomm.jar"/>
+	<classpathentry kind="lib" path="library/jssc.jar"/>
 	<classpathentry combineaccessrules="false" kind="src" path="/processing-core"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>

java/libraries/serial/build.xml

@@ -3,7 +3,7 @@
   
   <target name="clean" description="Clean the build directories">
     <delete dir="bin" />
-    <delete file="library/pdf.jar" />
+    <delete file="library/serial.jar" />
   </target>
 
   <target name="compile" description="Compile sources">
@@ -18,7 +18,7 @@
 	   srcdir="src" destdir="bin" 
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
-	   classpath="../../../core/library/core.jar; library/RXTXcomm.jar"
+	   classpath="../../../core/library/core.jar; library/jssc.jar"
 	   nowarn="true"
 	   compiler="org.eclipse.jdt.core.JDTCompilerAdapter">
       <compilerclasspath path="../../mode/ecj.jar" />

java/libraries/serial/library/jssc.txt

@@ -0,0 +1 @@
+This is using a modified version of Java Simple Serial Connector by Alexey Sokolov. See https://github.com/gohai/java-simple-serial-connector for details on the modifications.