Add missing/newer configuration to main cnf definition.

- min_pwlen
- textsec_mod
- automsg_mod
- xtrnsec_mod
- nodelist_mod
- whosonline_mod
- privatemsg_mod
- logonlist_mod

Since cnflib.js doesn't save/restore padding areas (yet), this explains
why using scripts that use cnflib to update/modify configuration files
could result in some settings being reverted to default or blank values
unexpectedly.

Next-up: fix cnflib so it saves and restores padding areas in .cnf files.