Pvl.h: 2010-07-12 Steven Lambright - It's a bad idea to copy...

Pvl.h: 2010-07-12 Steven Lambright - It's a bad idea to copy p_internalTemplate in the copy constructor since it describes whether or not to delete an internal pointer.  

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@161 41f8697f-d340-4b68-9986-7bafba869bb8