Cannot install as shared application on gnu/linux

uDig cannot be installed on gnu/linux as a shared application.

If user alice installs uDig under /foo, even if Alice grants permissive settings on the application with
chmod -R a+w /foo
when user Joni attempts to run uDig with
/foo/udig/udig
then uDig launches and the JVM right away reports the error reported by Prof. Keitt in his message to the mailing list:

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I tried RC9 today and two things I noticed:

1) If I download and unzip everything into /opt/udig as root and then
run uDig as an ordinary user, it dies with JVM error code=13.
Apparently uDig needs write access to its installation directory in
order to work. That makes no sense in a Linux environment where app
directories are generally not touched by users.

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Note also that this category of bugs could be altered from 'installer' to 'installation' issues.

--adrian