v1.4.4

• Fixed incorrect copying of cursor key data in IWDB_COMPOUND_KEYS mode (iwkv.c)
• Added compound key example code (compoundkeys1.c)
• Added iwstree_visit (iwstree.h)
• Fixed errors found by PVS studio
• Added IWULIST, IWLIST implementation (iwarr.h)
• Added iwpool_split_string (iwpool.h)
• Added iwpool_printf (iwpool.h)
• Added iwpool_printf_split (iwpool.h)
• Added iwxstr_shift (iwxstr.h)
• Added #define RCHECK (basedefs.h)
• Better error handling of kh_put