Production-harden code

[brettkettering]

We need to go through the code and look for places where hard coded constants are used, array index constraints are not checked, etc. and fix these. Some of these things allow run-time errors to occur that are not detected by the C run-time environment.

There is at least one place in the ad_plfs layer where a "define" constant controls the debugging output. This needs to be converted to the mlog system so that we can turn-on and -off debugging output at run-time instead of compile-time.