move disconnect button to be above the other comms buttons
button to show symbol path of nodes in a treeview
slightly more readable
dont call pre/post write callbacks if callback is null
Merge pull request #30 from coherentsolutions/master

dont call pre/post write callbacks if callback is null
Merge pull request #31 from othane/master

nice things
fix really annoying missing case warning (from gcc)

just default it to nothing so gcc wont warn
fix annoying printf waring in unit tests !
Merge pull request #32 from othane/test_printf_warning

fix annoying printf waring in unit tests !
Merge pull request #33 from othane/case_warning

fix really annoying missing case warning (from gcc)