Report dimensions of matrices involved in bad recycling errors about macpan2

[stevencarlislewalker]

Current behaviour (FYI -- @bbolker):

> engine_eval(~dnorm(1, 1:2, 1:3))
Error in self$.runner(..., .phases = .phases, .method = "report") : 
The following error was thrown by the TMB engine:
  cannot recycle rows and/or columns because the input is inconsistent with the recycling request
This error occurred at the following expression:
  output ~ dnorm(1, 1:2, 1:3)
This error occurred in the following function:
  dnorm
This function call got 3 arguments, each of which is described by the rows of the following table:

Rows  Cols  Types 
----  ----  ----- 
1     1     double
2     1     double
3     1     double