update, migrate, and extend backup client

[Robert Jäschke]

The current backup client (see http://blog.bibsonomy.org/2008/02/bibsonomy-backup-client-available.html) has not been updated for years. It lacks basic functionality, e.g., backup of documents and other "additional" information for posts (e.g., extra URLs, ratings and likely private notes). Please

0) migrate the backup client to the GitHub project bibsonomy-tools: https://github.com/rjoberon/bibsonomy-tools 1) extend the backup client with functionality to backup documents 2) extensively test the client and fix minor issues (e.g., spelling errors) 3) check, which other data is missing and how it could be added (in particular extra URLs and private notes; ratings/discussions are NOT important for now)

discuss all this with Robert

[Daniel Zoller]

extracted issues can be found in the issue tracker of the backup client project