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Add ability to select IPv4 leases by address and Subnet ID.

Make the names of the columns consistent between the lease4 and
lease6 tables.

This constructore is for use by the MySQL code.  By passing buffer
addresses and lengths, the need for the creation of intermediate
std::vectors is avoided.

... in preparation for adding IPv4 tests

Also fix some issues from the review.

note I renumbered existing entry.

I expect we'll need the string object version of token pretty often
for rrtype and TTL, and this version will help make it a bit more
efficient.

this will help constify 'c' in String::handle.

this will help unify the conditions and keep the code concise, and is
hopefully a bit more efficient.

EOL/EOF will be always returned if found; INTIAL_WS will be returned
only specified in option

use two tabs before the committer username.
use a tab before the keyword type.
lines too long

some of the changes are unrelated to this branch, but they
were minor and I noticed while reviewing.

grammar improvements

remove unuseful shutdown examples

add some docbook formatting tags

commented out an empty TODO section.