Fix the vertical bearing of the `v` glyph so that it does not appear
to be one pixel above the others.
Also add glyphs for
* dot-product (`⋅`, U8901)
* cross-product (`⨯`, 10799)
These can be used to refer to the `CROSS` and `DOT` commands.
Fixes: #1117
Signed-off-by: Christophe de Dinechin <christophe@dinechin.org>
Add the `Edit` feature to the interactive stack.
When editing an object and replacing it with multiple objects, the
objects are inserted at the interactive stack location.
Add the `Info` button to show information about the stack level.
Separate the `Sort` feature into `MemSort` (sort by memory
representation) and `ValSort` (sort by value).
Add the `EchoNSp` to echo without spaces the way the HP48 does.
Fixes: #1031
Signed-off-by: Christophe de Dinechin <christophe@dinechin.org>
