Commits on Aug 11, 2015

1. Convert block heights to int32. …

   This commit converts all block height references to int32 instead of
   int64.  The current target block production rate is 10 mins per block
   which means it will take roughly 40,800 years to reach the maximum
   height an int32 affords.  Even if the target rate were lowered to one
   block per minute, it would still take roughly another 4,080 years to
   reach the maximum.
   
   In the mean time, there is no reason to use a larger type which results
   in higher memory and disk space usage.  However, for now, in order to
   avoid having to reserialize a bunch of database information, the heights
   are still serialized to the database as 8-byte uint64s.
   
   This is being mainly being done in preparation for further upcoming
   infrastructure changes which will use the smaller and more efficient
   4-byte serialization in the database as well.

   

   davecgh committed Aug 11, 2015
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