Add count parameter for some commands

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Perhaps we should add a count parameter for some commands when we only want to 
find out how many elements are in a certain list (eg stored, journal). For 
example, "stored johnthegreat count" would return the number of stored games I 
have. This would reduce the amount of parsing (overhead) necessary for certain 
types of bots, etc.

Original issue reported on code.google.com by John.Nahlen on 13 Oct 2011 at 6:56