added dna part button to toolbar
radnano icon
Merge branch 'master' into buttondev
added icon-label pref, started tool view
switch from horizontal to vertical layout
Merge branch 'buttondev' into partdev
part → origamipart
Merge branch 'master' into partdev
dnapart and dnapartitem
tweaking some sizes used in testing
Merge branch 'arraydev' into partdev
Merge pull request #25 from cadnano/partdev

sync partdev with arraydev