LOAD PDB FILES

PDBs can be loaded in by three methods:
1. load a single PDB file containg all structures
2. read from a file containing pdb file names (1 per line)
3. using a rootname and specification of 
   first and last pdb file numbers

Each time a pdb file is read, an object with the 
identical name will be created by PyMOL.

For example, if you load these three files:
aria_10.pdb
aria_1.pdb
aria_6.pdb

The three pdb files will be loaded, and the 
resulting objects will be named:
aria_10
aria_1
aria_6


