Parser does not support named arguments

[nikololiahim]

The following example from the paper is not recognized by the parser:

distance.
  point
    5:x
    -3:y
  point:to
    13:x
    3.9:y

[fizruk]

I think J2EO and C2EO do not rely on named arguments, so we can, probably, ignore this syntaxes safely. @Leosimetti please update documentation of odin, mentioning that we do not support this syntax. When documentation is updated, we can close this issue.