dump.c - add ways to dump HV's and AV's and SV's to any depth.

Currently you can use sv_dump() to dump an AV or HV as these are
still SV's underneath in C terms, but it will only dump out the top
level object and will not dump out its contents, whereas if you have
an RV which references the same AV or HV it will dump it out to depth
of 4.

This adds av_dump() and hv_dump() which dump up to a depth of 3 (thus
matching what sv_dump() would have showed had it been used to dump
an RV to the same object). It also adds sv_dump_depth() which allows
passing in an arbitrary depth. You could argue the former are redundant
in light of sv_dump_depth(), but the av_dump() and hv_dump() variants
do not require a cast for their arguments.

These functions are provided as debugging aids for development. They
aren't used directly in the core, and they all wrap the same core
routine that is used for sv_dump() (do_sv_dump()).

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