* Improvements to get rid of timeout-problems opening URLs: catch
timeout and retry urlopen() several times  
* Caching Main Page to reduce redundant requests to get the topic URLs. 
* Added Metadata in URL Request: User-Agent
* addon.xml: added http:// to <website>, corrected first version number
(0.1 -> 1.0.0)
* Several code improvements
Refactoring
Refactoring
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version number 1.0.1
corrupt import removed
adjusted socket timeout
removed unused import and log output