* df-problems.c (df_chain_create):Use new type-based pool allocator.
	(df_chain_unlink_1) Likewise.
	(df_chain_unlink) Likewise.
	(df_chain_remove_problem) Likewise.
	(df_chain_alloc) Likewise.
	(df_chain_free) Likewise.
	* df.h (struct dataflow) Likewise.

From-SVN: r223953