Dependency perl code

Configuration files

While the DPC code is typically found in public_html/cgi-bin/update, the configuration files should be found in public_html/cgi-bin/update/config. They need to be written by the user and there are up to three configuration files:

• Dependency file: contains all the instructions which are used by the DPC to update the file system. Typically this is called dependencies.dat, but the name can be changed by using the --depend argument.
• Problems file: list the files that the shouldn't be created (generally because they can't be created). This is optional and is called problem_files.dat.
• Compress file: list the file types that want creating. This is also optional and is called compress.dat.

Information on these files can be found from the links above. The dependency file is read by the DPC first, so definitions defined in this file can also be used by both the problems and compress file.

In addition to this there's a few changes to the perl code that are required.