2008-01-25 Timo Bingmann
* btree.h: Fixed a valgrind-detected bug based on a new test case
received via email. During the find() function find_lower() is
called and returns the slot number with the smallest or equal
key. However if the queried key is larger than all keys in a leaf
node or in the whole tree, find_lower() returns a slot number past
the last valid key slot. Comparison of this invalid slot with the
queried key then yields an uninitialized memory error in valgrind.
2007-05-12 Timo Bingmann
* btree.h: Fixed segfault in print() because of non-existing root.
Fixed segfault in end() when the tree is totally empty.
Added BTREE_FRIENDS macro so that wxBTreeDemo can
access private members.
Changing print function to output to a user-given
std::ostream
