rql #190394 make variables more readable in an rqlst repr [validation pending]

e.g:

Any VarRef(0X4BB06D8) to S(0X53DDDE0),VarRef(0X4BB0FC8) to N(0X53DD830),VarRef(0X4BB0BA8) to D(0X53DD520),VarRef(0X4BB0940) to STA(0X53DDEC0),VarRef(0X4BB0E10) to STO(0X53DD7C0),VarRef(0X4BB0C00) to P(0X53DD670),VarRef(0X4BB0310) to E(0X53DD3D0),VarRef(0X4BB0E68) to L(0X4695D70),VarRef(0X4BB0158) to SP(0X4695980),VarRef(0X4BB0F18) to MA(0X4695590),VarRef(0X4BB0208) to ACT(0X46951A0),GROUP_CONCAT(VarRef(0X4BB0100) to ATT(0X4695520)) GROUPBY VarRef(0X4BB0838) to S(0X53DDDE0),VarRef(0X4BB0998) to N(0X53DD830),VarRef(0X4BB0DB8) to D(0X53DD520),VarRef(0X4BB0470) to STA(0X53DDEC0),VarRef(0X411CE68) to STO(0X53DD7C0),VarRef(0X411CAA0) to P(0X53DD670),VarRef(0X411C5D0) to E(0X53DD3D0),VarRef(0X31C39F0) to L(0X4695D70),VarRef(0X31C3260) to SP(0X4695980),VarRef(0X31C3DB8) to MA(0X4695590),VarRef(0X31C3788) to ACT(0X46951A0) ORDERBY VarRef(0X31C3D08) to STA(0X53DDEC0) DESC WHERE Relation(VarRef(0X31C3B50) to S(0X53DDDE0) is = Session) AND Relation(VarRef(0X31C3A48) to S(0X53DDDE0) name = VarRef(0X31C3F18) to N(0X53DD830)) AND Relation(VarRef(0X31C30A8) to S(0X53DDDE0) description[right] = VarRef(0X31C35D0) to D(0X53DD520)) AND Relation(VarRef(0X31C3310) to S(0X53DDDE0) starttime = VarRef(0X31C3AA0) to STA(0X53DDEC0)) AND Relation(VarRef(0X5ACD628) to S(0X53DDDE0) endtime = VarRef(0X5ACD0A8) to STO(0X53DD7C0)) AND Relation(VarRef(0X5ACDBA8) to S(0X53DDDE0) at_place[right] = VarRef(0X5ACD9F0) to P(0X53DD670)) AND Relation(VarRef(0X5ACD730) to S(0X53DDDE0) use_equipment[right] = VarRef(0X5ACDC00) to E(0X53DD3D0)) AND Relation(VarRef(0X5ACDC58) to S(0X53DDDE0) level = VarRef(0X5ACD940) to L(0X4695D70)) AND Relation(VarRef(0X5ACD680) to S(0X53DDDE0) spirit = VarRef(0X5ACD1B0) to SP(0X4695980)) AND Relation(VarRef(0X5ACD2B8) to S(0X53DDDE0) max_attendees[right] = VarRef(0X5ACD260) to MA(0X4695590)) AND Relation(VarRef(0X5ACD4C8) to S(0X53DDDE0) activity = VarRef(0X5ACD310) to ACT(0X46951A0)) AND Relation(VarRef(0X5ACDFC8) to ATT(0X4695520) attends[left] = VarRef(0X5ACDEC0) to S(0X53DDDE0))

vs:

Any VarRef(S),VarRef(N),VarRef(D),VarRef(STA),VarRef(STO),VarRef(P),VarRef(E),VarRef(L),VarRef(SP),VarRef(MA),VarRef(ACT),GROUP_CONCAT(VarRef(ATT)) GROUPBY VarRef(S),VarRef(N),VarRef(D),VarRef(STA),VarRef(STO),VarRef(P),VarRef(E),VarRef(L),VarRef(SP),VarRef(MA),VarRef(ACT) ORDERBY VarRef(STA) DESC WHERE Relation(VarRef(S) is = Session) AND Relation(VarRef(S) name = VarRef(N)) AND Relation(VarRef(S) description[right] = VarRef(D)) AND Relation(VarRef(S) starttime = VarRef(STA)) AND Relation(VarRef(S) endtime = VarRef(STO)) AND Relation(VarRef(S) at_place[right] = VarRef(P)) AND Relation(VarRef(S) use_equipment[right] = VarRef(E)) AND Relation(VarRef(S) level = VarRef(L)) AND Relation(VarRef(S) spirit = VarRef(SP)) AND Relation(VarRef(S) max_attendees[right] = VarRef(MA)) AND Relation(VarRef(S) activity = VarRef(ACT)) AND Relation(VarRef(ATT) attends[left] = VarRef(S))