Updated jkstat

It's been a while (almost a year) since I last updated jkstat, but I've just put version 0.13 up for download.

For those that don't know, jkstat is a Java jni interface to Solaris kstats, allowing you to access a wide range of useful data held by the Solaris kernel from a Java application.

One thing I have done is this version is try to improve the look of the sample applications, most of which has been achieved by replacing the rather clumsy GridLayout with SpringLayout.