New MLDonkey release 2.8.2

- Multiuser ability, details in docs/multiuser.txt
- faster hashing, optimize source handling to reduce CPU load
- new command "porttest", support for eMule- and Azureus-style porttest
- new command "bw_toggle"
- new feature "Release slot"
- EDK: Improved file publishing
- EDK: Support aMule/Hydranode os_info tag
- EDK: parse all fields from server.met
- EDK: Improve server logins, send fewer data
- Overnet updates
- BT: recognize more client types
- some updates to GD generated graphs
- new option rss_preprocessor
- lots of small updates/fixes, see Changelog for details