Add flags arg to sv_size:
    flag to use link label as sv label
Move addr out of attr.
Add db transform to hide RV's (though check for addrs pointing to it first)
Split db into separate node and link tables
Sort out naming:
    id vs name vs label
    descriptive: Foo::, {keystr}, [42], *GLOB, etc (longer)
    pass-thru enogh info to perform 'decoration' on output
Better handling of pads
    especially padtmp
    eg add scope, or ideally line range when emiting pad names
    Perhaps add general flags UV attr that contains flags appropriate to the node (eg SV or pad)
Review general SV and attribute handling
    Emit more raw info
Add global attributes, especially perl version
PL_strtab sizing
    See hek_size()
    Long unique keys show up as bloat in PL_strtab even though they've been seen before PL_strtab is sized?
    make && SIZEME_HIDE=7 SIZEME='|bin/sizeme_store.pl --db sizeme.db --gexf sizeme.gexf' perl -Mblib -MDevel::SizeMe=:all -e '$k="k" x 10_000; push @a, { $k.scalar(@a) => 1 } while @a<1_000; perl_size()'
Fix spelling of leafs!

*** Random TODOs:

See https://github.com/timbunce/devel-sizeme/issues

Integrate changes back into Devel::Size so we can share a common core.

Restructure:
    Devel::SizeMe::Core - loads XS and sets options
    Devel::SizeMe - loads Devel::SizeMe::Core
        -d:SizeMe=opts?
    Devel::SizeMe::Stream - parse raw stream
    Devel::SizeMe::Store - db write
    Devel::SizeMe::Data - db read / orlite?
    Devel::SizeMe::Graph - data reading/processing for sizeme_graph
    sizeme_store - script wrapper for Devel::SizeMe::Store
    sizeme_graph - Mojolicious app wrapper using Devel::SizeMe::Graph
Move Devel::SizeMe::Graph and co out to separate distro.

Link and item names should match perlguts/perlapi names.

Tests!
hv placeholders
[ 1 => [] ]
$x=[]; push @$x, $x; total_size($x); # loop


Reduce data volume to optimize usage and visualizations
    ideally as an optional post-processing on the db tables
    drop SV(RV) detail?
        for cases where there's only a single ref to the SV(RV)
    prune
        bottom up delete nodes below a certain size, add size to parent
        only if the parent is the only node refering to it

Docs
    note TARG effect on total_size([[]]) not counting the inner ref due to refcnt
    note issues around sizing of hash keys (re shared string table)
    note won't recurse into a struct that holds a ref to itself, by default

Random References:
http://cpansearch.perl.org/src/RURBAN/illguts-0.42/index.html
http://www.html5rocks.com/en/tutorials/memory/effectivemanagement/

Graph file formats:
    dot (graphviz)
    graphml
        http://en.wikipedia.org/wiki/GraphML
        http://graphml.graphdrawing.org/primer/graphml-primer.html
    gexf - http://gexf.net/format/
        http://gexf.net/1.2draft/gexf-12draft-primer.pdf
    gml - https://gephi.org/users/supported-graph-formats/gml-format/
    gdf - https://gephi.org/users/supported-graph-formats/gdf-format/
    net (Pajek)
    vna (netdraw)
    https://gephi.org/users/supported-graph-formats/
    Suitable: gexf, gml, graphml (also gdf)

Useful techniques:
    Treemap (switch to d3, eg http://jasonlally.github.io/data-portal-treemap/)
    Hypergraph - hides distant detail

Network Visualization tools:

https://gephi.org
    http://gephi.org/tutorials/gephi-tutorial-visualization.pdf
    Import: dot, gml, gdf, graphml, net, vna, tlp
    Export: dl, gdf, gexf, gml, graphml, net, vna
        https://marketplace.gephi.org/plugin/sigmajs-exporter/
    http://stackoverflow.com/questions/tagged/gephi
    Opt-click-drag on mac trackpad to alter 3d view
    http://wiki.gephi.org/index.php/Scripting_Plugin

http://www.cytoscape.org
    http://cytoscape.org/manual/Cytoscape2_8Manual.html#Supported%20Network%20File%20Formats
    Import: gml, xgmml, sbml, biopax, psi-mi, sif, nnf
    Export: xgmml, psi-mi, sif, nnf

http://zvtm.sourceforge.net/zgrviewer.html
    Java app. Import: dot
http://sourceforge.net/projects/hypergraph/
    Java Applet.
https://github.com/uskudnik/GraphGL
    JS. Designed for rendering massive graphs. Immature.
http://tulip.labri.fr/TulipDrupal/
    Import: dot, gml, gexf, net, tlp
    Export: gml, tlp
Graphviz - sfdp
http://ophid.utoronto.ca/navigator/
