Update to 5.3.0
Upstream changes:
http://www.scilab.org/content/download/1791/19327/file/changes5.2.2-5.3.0.pdf
Port changes:
-Drop dependency on readline from ports - this was never removed from the 4.x
port and isn't used
-Make UMFPACK off by default - the only reason it was on by default was for
consistency among 5.2.x versions, since I didn't expose the knob through
OPTIONS properly until 5.2.2
-Update JGraphX to compatible version for Scilab 5.3.0
-Scilab does not start java in the normal way (with javavmwrapper) so the
JAVA_HOME environment variable isn't set properly. Explictly set JAVA_HOME
to whatever was used to build the port. This seems to correct occasional
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