Remove deprecated glib function g_tree_traverse() in sequence.c by replacing
tree implementation with POSIX tdelete()/tfind()/tsearch().
Remove deprecated glib function g_tree_traverse() in rangetree.c by
replacing tree implementation with POSIX tdelete()/tfind()/tsearch().

Removed RangeTree_insert_list(): The new RangeTree_insert_recent() inserts
elements starting at the root node of the recent_data tree, which should
obviate the need for shuffling.
Remove deprecated glib function g_tree_traverse() in gam.c by
replacing tree implementation with POSIX tdelete()/tfind()/tsearch().