[F01] Fix Relation grammar

[matheuslenke]

Two errors arised at relations:

1. Wrong cardinality order
   Current behavior:

relation A (a) [*] -- isConnectedTo -- [*] B (b)

Expected Behavior:

relation A (a) [*] -- isConnectedTo -- [*] (b) B

2. Cardinality should be possible to omit at second end
   Expected Behavior:

kind A
{
    -- [1] A
}

This relation should not need [1] to be explicit to be correct