PCL-ENV glitch

[fritzson@bigburd.PRC.Unisys.COM (Richard Fritzson)]

Thanks for posting a new version of PCL-ENV. 

In the file PCL-ENV, there is a minor bug.

In the function frame-instance: 

The call to pcl::fnheader-debugging-info ought to be a call to
xcl::fnheader-debugging-info. (Otherwise, you will get interrogated by
DWIM everytime you break.)