Parentheses are no longer placed around functions, fixes #103

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>
Dragging an operation to an 'empty' screen now always succeeds.
Fixes #105

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>
Put a limit to the maximum amount of characters in a symbol.
Fixes #43

Signed-off-by: Mark Kamsma <mark@markkamsma.nl>