framework for easy creation of Enterprise Application Integration tasks

Changes for 1.903

• added lookups to %config to allow for an additional merging of configs based on prefixes (especially for DB and FTP), added additionalParamsGet, additionalParamsPut, additionalParamsNew and additionalMoreArgs to EAI::FTP for more general usage of Net::SFTP::Foreign get, put and new. fixed error retry by adding $execute{retryBecauseOfError} to the condition of early returning from already successfullyDone subs. Reverted generalization of getKeyInfo to getSensInfo back as merging of lookups is now done generally. Added CONTRIBUTING text.