use canvas_getrootfor instead of glist_getcanvas, guarantee editor gets created when reloading abstractions

remove redundant call in g_mycanvas.c and filter repeated label updates if
the label hasn't changed as in Pd Vanilla

it works with pd~

Fix bug in which stdout didn't catch on that it should send to parent pd~
in binary; this was caused by different startup order when pd~ was started
with or without GUI (it failed when non-GUI, binary mode).

However, we still need to figure out if we want to supress gui_canvas_getscroll
when suppressing the scrollbars. Currently it still gets called, which will
adjust the viewport to make objects at negative indices visible. I think
instead we want to anchor the viewport to 0,0 at top left and supress those
calls to get a nice speedup in the GUI.

commit: 619f056b3f39e04e482d04854c1c166de2621d64

commit: 306dc0559ccfbeb2c0ab02843d572bb1f3bf85f6

commit: 3f92d75115d8e8a2ab5a8234be0326b6391ac378

(tcl errors on closing a patch in which a scalar was getting a deferred
update, usually I think because of an array).

commit: 418c7380b066db065dcc8a3315f4a6ca61f7bf1c

just leave the title unchanged you don't get "save as" action again on
next save

commit: 470032130e2b0135b97151d719c4706d68f3c380

We ignore the reversion and workaround in a later vanilla commit for an
OSX tk issue that doesn't apply to nw.js