Plus42 Equations, Preview Release

[Thomas Okken]

New update:

1. Fixed behavior of CALC when an equation is selected that has no menu variables.
2. Windows, Mac, and Linux only: Cursor left, cursor right, and delete on the physical keyboard now activate menu keys labeled ← (left), <← or ↑ (shift left), → (right), →> or ↓ (shift right), and DEL (delete). This works in the equation editor, but it also works in any other menu with keys with those labels, most notably the matrix editor.