added/fixed GtkMessageDialog
msgdialogs: OK->CLOSE, ask->NONE w/ optional buttons
ask_dialog limited to 2 buttons
a 3rd try at ask_dialog's function signature
MessageDialog now inputs a Dict of buttons
couple of small fixes
couple more small things
reordered input args; best practice README, @eval func defs, optional parent
use regards more consistently in dialogs (breaking), and other minor tweaks
more v0.2 compat misses
v0.2 compat