Trigger max_threads upon reaching the limit

Trigger "max_threads" event (and thus "threadMaxThreads" trap, with
default SNMP configuration) upon reaching "max_servers" thread limit,
instead of on an attempt to exceed it, as the latter never happens.
Need to process at least one group entry before we check if we need to continue
Assert head pointer isn't NULL if sql_get_grouplist returned 1 or more groups
make sqlite defaults a bit friendlier
Allow for enforcement in post-auth

Which is really where they should be
Build on FreeBSD
Set variable to default value.
Be more generous about the lack of whitespace
Note recent changes
Re-arrange code to be cleaner
timestr_match returns int, not uint32_t
Minor fix
Name for stdin should be "-" for backwards compatibility
Fixup weirdness in couchbase configure.ac
Cleanup formatting in rlm_realm
Soft assert and exit on internal validation error
Fix parenting issue in paircmp.c
Fixup policies to use attribute references
Fix section lookup in radwho
Found should be a bool