All STRUCT cf_fmt_config_xxx() functions omit invalid values, silently
if the invalid value is the default, otherwise with a non-CFOK return
value.
The "config dump --full" option includes all options with valid values,
otherwise omits options having default values.
No more SEGV. Omits invalid (default) values. Logs unconditional DEBUG
output, to be removed before merging into development. Still missing
cf_cmp_ functions to prune out default values.
Improved config Object Model iterator logic to barf on internal NULL
nodes.
Replace 'parsefunc' (cf_opt_foo) function arguments in schema
declarations with 'repr' (foo) names, which are used to declare
cf_opt_foo and cf_fmt_foo.
Config Object Model parser now returns bitmask result of CFxxx flags and only
allocates root node if the config file is non-empty.
Added emalloc_zero().
