track down noLD warnings?

[bbolker]

BDR reports that profbounds.R throws a warning under noLD:

* using log directory ‘/data/gannet/ripley/R/packages/tests-noLD/bbmle.Rcheck’
* using R Under development (unstable) (2019-12-19 r77606)
* using platform: x86_64-pc-linux-gnu (64-bit)
...
  Comparing ‘profbound.Rout’ to ‘profbound.Rout.save’ ...26,28d25
< Warning message:
< In mle2(minuslogl = function (a = NULL, b = NULL)  :
<   convergence failure: code=52 (ERROR: ABNORMAL_TERMINATION_IN_LNSRCH)

This is worked-around (via suppressWarnings()) - still needs to be uploaded to CRAN - but could conceivably be fixed by testing on R-hub ...