Fontforge 21 June pkg has problems under 10.3

[scratch65535 at att.net]

The 21 June pkg build seems to have a number of glitchy problems
under 10.3.   I'm afraid I don't have time to do more than
mention them at present.

- the flop (docs call it flip) tool doesn't seem to work at all.

- the scrollbars frequently complain about having illegal values
during node debugging.

- the ability to "make arc" almost never works (it might have
something to do with how fresh the session is, but  I've not had
the time to do any testing).

- trying to change only one segment from line to curve with the
curve tool (almost?) never works -- it changes multiple segments
(almost?) every time.

- the default button during resize should be "apply" not "ok"
because resizing is more likely to require successive
approximations than done-in-one  (this is a UI problem, not a
glitch)