several -J command-line switches checks and documentation

[reedjc]

Since dnsdbq already fails on some wrong command-line option combinations, consider some more for -J:

1. dnsdbq allows -t with -J mode, but -t is ignored
   fail if -t is also set

2. dnsdbq allows -V summarize with -J mode, but -V summarize is ignored
   (also -M is allowed with -J)
   fail if -V is also set

3. please better document dnsdbq -J mode. It can be sorted for example.
   It can be limitted with -l and -L and -A and -B (that is surprising to me). what else?

4. Does allowing -J with -g make sense? it cannot change aggregation

5. dnsdbq -O is allowed with -J and -O does nothing.

6. dnsdbq -J shouldn't allow -u since does nothing

[vixie]

all fixed.