Added experimental IPv6 support. I'm not an expert in IPv6, so I would appreciate some beta testers.

Packaging changes: remove .sh extension from init script, use 'tar' for final packing step.

Add deb package, roll up changes.

Warnings:

• renamed wrtbwmon.sh to wrtbwmon
• added init script and cron entries

check your configurations!

• transition from invocation as "wrtbwmon" to "wrtbwmon.sh"
• update readme
• add ipk
• install files according a standard filesystem layout
• remove peak/offpeak distinction
• add init script
• perform reverse DNS lookups to find hostnames
• fix locking issues
• add "dump" option