memory usage, EC, ed2k and categories

I'll keep this shorter and more user related in the future and will not refer to small changes or bug fixes, unless they affect the user directly.

In the last month, Freddy77 wrote many patches with the effect of a reduced memory usage for aMule. This will make run aMule better on embedded devices with little RAM.

We changed the EC (External Connections) authentication procedure to improve security. New developmental versions (and the future 2.3.0) are incompatible to 2.2.3 and older, so you need newer versions of both aMule/amuled and amuleGUI, amuleweb or any other tools using EC.

The ed2k utility supports finally categories. If you have custom scripts, you can now use the -t or --category argument in combination with the category number to add a link to a particular category. (Example: ed2k -t 1 ed2k://|file|...|/)
You can find the category numbers in the configuration file amule.conf.

If you don't want to use ed2k, you can add these information directly to the ED2KLinks file in the aMule config directory. Append a colon and the category number to the link.