[ic] "if file-e" functionality in user tag?

[Jeff Boes]

> 
> The -f file test -- which should be OK for testing for an image
> file -- is allowed by default.  That means 
> 
> 	if (-f $file) { do_something() }
> 
> should work fine.


Hmph. You might think so, but ...

Configuring catalog vanilla...UserTag 'veh_image' subroutine failed safe
check: '-e' trapped by operation mask at (eval 381) line 17, <CONFIG>
line 25.

UserTag 'veh_thumb' subroutine failed safe check: '-e' trapped by
operation mask at (eval 383) line 12, <CONFIG> line 20.