Version mkgmap-r3875 was committed by gerd on Sat, 01 Apr 2017

decrease peak memory and improve speed for global index creation

- use memory cache were it helps and free memory for caches after SortKey are 
calculated
- always free memory for mdr19 data
- implement (undocumented) --x-mdr7-excl filter for street name index. Not very 
useful until user knows special names which should not appear in the street 
search. 
- Use new DoubleSortKey instead of MultiSortKey in Mdr7.
- Don't compare sort keys byte by byte if both are the same, which is quite 
likely
with the caches


http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3875
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