Source code updated in SVN, r13: delete protein from database

The code in the SVN has been updated to r13. The new version of PLCC has support for deleting a protein from the database. (You can ignore this if you don't use the database functionality of PLCC).

Updating a protein in the database, e.g. because a newer version of the PDB file becomes available, was already supported before this - but deleting a protein was not. This is necessary when a PDB file becomes deprecated though.

Here is the command line to delete protein with PDB ID 8icd from the database:

./plcc NONE --del-db-protein 8icd

This will delete the whole protein - including all its chains, SSEs, contacts, graphs, etc. - from the database.

Note: The first parameter is "NONE" because this command does not operate on any input PDB file.