[E-Lang] security manager problem solved

[Marc Stiegler]

Ah, yes, the joys of upwards compatibility breaks :-)

What I thought were SecurityExceptions thrown by the Security Manager were
actually being thrown by the new E interpreter, because I had forgotten that
the phrase

<import:uri>

had been replaced with

<unsafe:uri>

although import: still has a meaning so does not throw a syntax error.

--marcs