Linux client packages should be runnable from the desktop

[spli]

The current linux clients can only be running the included shell scripts at the command line. It would be nicer if they could be started by double clicking in a standard desktop environment, perhaps a .desktop file would be enough?

The INSTALL file also needs updating.

[spli]

It looks like desktop files can only contain absolute paths, so I think the next best option is to modify the scripts to run from any working directory.

[spli]

Another alternative is to write a compiled program:
run_insight.c:

#include <unistd.h>

int main()
{
	char *args[4];
	args[0] = "-Xms256000000";
	args[1] = "-Xmx1024000000";
	args[2] = "-jar";
	args[3] = "omero.insight.jar";
	return execvp("java", args);
}

$ gcc -Wall run_insight.c -o run_insight

will produce a binary run_insight which runs when double clicked.

[spli]

In futureO we could look at packaging the clients as a binary rpm or deb. For now I've edited the shell scripts:

​https://github.com/openmicroscopy/openmicroscopy/pull/1728

[spli]

Also ​https://github.com/openmicroscopy/openmicroscopy/pull/1736 (dev_4_4)