Eliminate more unnecessary quoting.

Start of additional parameter support for Net::DSI, allowing overrides
of the active and idle timers.

Disabled idle timer checks for now, as some devices do not keep up with
sending tickle packets, thus causing unnecessary failures.

Added active timer checking for transactions in progress.

Changed pack masks to use byte ordering qualifiers instead of 'N' and 'n'
types, which allows us to use signed types without having to worry
about doing the 2's complement math ourselves.

Shorten the deref path to the transaction handler hash.

Eliminate a warning with Perl 5.18.

Use keys/while() instead of foreach().

Align assignment groups.