Relationship Querying

Table 1. Functions
`apoc.rel.id(rel)`	returns id for (virtual) relationships
`apoc.rel.type(rel)`	returns type for (virtual) relationships
`apoc.any.properties(rel, )`	returns properties for virtual and real rels. Optionally restrict via keys.
`apoc.any.property(rel)`	returns property for virtual and real rels

Table 2. Procedures
`CALL apoc.get.rels(rel\|id\|[ids])`	quickly returns all relationships with these ids