Patch for review: Adding default value to certain attributes

[Man Wong]

This patch allows netx to not cause a failure when the codebase and href attribute under the jnlp tag is missing (codebase and href are not required attributes, hence missing them should not cause an exception to be thrown). 

Changelog:
2010-01-15  Man Lung Wong <mwong at redhat.com>
    
         * rt/net/sourceforge/jnlp/JNLPFile.java
         (parse): Added a default value for sourceLocation to make sure it is not null
                  (location is never null).

         * rt/net/sourceforge/jnlp/Parser.java
                  Removed variable base, and replaced it with codebase. The fix ended 
                  with base the same as codebase, hence no longer needed. Otherwise, 
                  netx will launch a jnlp file with codebase null and href not null 
                  (not the way sun's webstart behaves).
          
         * rt/net/sourceforge/jnlp/runtime/JNLPClassLoader.java
         (setSecurity): Added a variable codebase, which gets the value of codebase
                        attribute in the jnlp file if it exists. Otherwise, it gets
                        the value of the location of main jar resource (which needs
                        to be changed to the codebase portion instead of the entire
                        location). 
                               
Any comments?

Thanks,

Man Lung Wong
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