Adding pre-upd and post-upd to .u.upd in tick.q

[LamHinYan]

After loading tick.q, what is the proper way to do so? Thx.

.u.upd1: .u.upd;

.u.upd:{[t;x]

  / pre-upd

  .u.upd1[t; x];

  / pos-upd

  };