>> ? display this help screen
> And F1 as commonly used for help [...]
Thanks. Here is what I've now committed, and I'm quite satisfied now.
```
F1, ? display this help screen
q, ESC quit ftmulti
F2 toggle axis grouping
F3 toggle outline hinting
F4 toggle embedded bitmaps
F5 toggle anti-aliasing
F6 cycle through hinting engines (if available)
space toggle rendering mode
, . previous/next font
Up, Down change pointsize by 1 unit
PgUp, PgDn change pointsize by 10 units
Left, Right adjust index by 1
F7, F8 adjust index by 16
F9, F10 adjust index by 256
F11, F12 adjust index by 4096
a, A adjust axis 0
b, B adjust axis 1
...
p, P adjust axis 16
-, + adjust axis range increment
```
Werner
