RTREEs will be used for GIS extension in MySQL


myisam/.cvsignore:
  Added sp_test and rt_test
myisam/Makefile.am:
  Added RTREE files
myisam/mi_create.c:
  Added RTREE/SPATIAL initialization
myisam/mi_delete.c:
  Switched to use virual function, instead of mi_ck_delete() direct call
myisam/mi_key.c:
  Added sp_make_key() call in the case of SPATIAL index type
myisam/mi_open.c:
  Added some new initialization actions which depend on key_alg being used: RTREE or BTREE
myisam/mi_range.c:
  Rtree estimation
myisam/mi_rkey.c:
  rtree
myisam/mi_rnext.c:
  rtree
myisam/mi_rnext_same.c:
  rtree
myisam/mi_static.c:
  New search flags for bounding rectungles
myisam/mi_test1.c:
  one now should always specify key_alg during keyinfo initializing: BTREE or RTREE
myisam/mi_test2.c:
  Added key_alg initializing
myisam/mi_test3.c:
  Added key_alg initialization
myisam/mi_update.c:
  Switched to virtual functions, instead of mi_ck_delete/mi_ck_write direct call
myisam/mi_write.c:
  Virtual function instead of mi_ck_write() direct call
myisam/myisamdef.h:
  Rtree additions