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A set of changes improving our RTree indexes and fixed few bugs found during the tests myisam/rt_index.c: Algorythm for picking the branch to insert was fixed. pick_by_perimeter version of the algorythm added (mostly for testing purposes) myisam/rt_index.h: minimal size of the page set to 1/3 It noticeable increases searching performance myisam/rt_key.c: counting of the size of the filled part of the page fixed rtree_choose_key moved to rt_index.c myisam/rt_key.h: no need to make rtree_choose_key global myisam/rt_mbr.c: operations for counting the perimeter of MBR added myisam/rt_mbr.h: interface for rtree_perimeter_increase myisam/rt_split.c: my_multi_malloc changed with my_alloca sql/spatial.cc: LINESTRING object can consist of single point
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