minor performance improvement for disk-based PrefixTree: instead of calling fread n times, call fread once and fill a temporary bufferwith the data that is to be loaded and then read from this array.
minor performance improvement for disk-based PrefixTree: instead of calling fread n times, call fread once and fill a temporary bufferwith the data that is to be loaded and then read from this array.

also rename a local variable in the create() routine that made the code somewhat unusual to read.



git-svn-id: f5d636078e73450abf2183305c5e43efec2a5605@915 1f5c12ca-751b-0410-a591-d2e778427230

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