Add arraysize option to runQuery in adbapi

New submission from Gerrat <None>:

The convenience method, runQuery in adbapi doesn't currently support executing a cursor with anything other than the default cursor arraysize.  The arraysize attribute controls how many rows are fetched at a time from the database (during a fetchall() or fetchmany() operation).  The default cursor arraysize is 1 (according to PEP 249), and using this arraysize results in terrible performance when retrieving a large number of rows from the database.  

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Type     : enhancement
Component: core
Keywords : adbapi arraysize review
Priority : normal
Nosy     : 
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http://twistedmatrix.com/trac/ticket/3956