[TYPO3-core] RFC: older versions of extensions cannot be installed

[Holzinger]

This is a SVN patch request. 

Problem:
When you want to install an older version of an extension you will end up in 
an error message:
Extension import results
Error: The datatransfer did not succeed. Error: MD5 hash of downloaded file 
not as expected:
a041f2a354634f2296622ec6e47d3ffe != 

http://bugs.typo3.org/view.php?id=4725 

Solution:
The EM must fetch the information of all versions of an extension the get 
the MD5 of it and not only the latest version of an extension. 

Test: Try to install tt_board 1.0.9 

Branches: TYPO3_4-1 and Trunk 

Greets, 

Franz
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