Poller Configurtation Enhancement and Receive File Location Control

1. Enhance the directory polling capability so that the configuration can be done in the partnership instead of the config.xml. The partnerships.xml file is now used to store directories to be polled using an attribute instead of the individual entries in config.xml. See the "Sending Files" section of the OpenAS2HowTo for details.
2. Enhance dynamic variables to support property variables in any configuration string that allows the use of dynamic variables. This allows using the properties to further simplify repeated dynamic variable strings in config.
3. Support overriding the default storage location for received files specified in the config.xml MessageFileMoule with a partnership attribute "store_received_file_to". The attribute supports the use of dynamic variables.
4. Change the HTTP error when an invalid message format is received from error to a warning and allow it to be suppressed using the "log_invalid_http_request" property.
5. Expand the classpath in the startup scripts instead of using file globbing expansion in the java command as it seems to mess with Mailcap loading causing DCH missing error.
6. Enhance documentation for areas that have user questions related to them to improve new user ease of configuring a new system.
7. Fixed the command processor so that it does not write the XML back to disk from objects that have been enhanced in the loader and therefore losing the generic config.
8. Rationalised the exception logging when significant errors occur so that there is less "noise" in the logging.
9. Added dependency management plugin to make it easier to keep the project updated with latest release versions.