[Kget] Way to manage connections per server

[Matthias Fuchs]

This patch would make it possible for users to define how many connections a 
server supports. All TransferMultiSegKIO datasources would respect this 
setting.

There are some problems with this patch imo.
On the one hand everything gets more complicated and it does not work well 
with TransferMultiSegKIO Transfers because of the following line

+//FIXME The following lines make it work nicely for Metalink yet kinda break 
it for TransferMultiSegKIO
+//I have not clue why it is that way though.
+    if (!isReady()) {
+        m_startTried = true;
+        emit notReady();
+        return;
+    }

in datasourcefactory.cpp

If I remove these added lines it works nice for TransferMultiSegKIO but not 
for metalink ...

So please have a look at this patch, btw. keep in mind that there is debug 
output in the patch at some places.
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