Set default Life duration of signature

[Tom Lener]

When adding a batch of new signatures by copy and paste, all signatures get life 72 hours by default. I need the signatures to life for 7 days, so i have to change it manually every time for every single signature.

It would be nice to have an option to set the life to 7 days by default.

Besides this, Tripwire does a great job! Thx :)

[Josh Glassmaker]

added option for default life of pasted signatures (non-wormholes). resolves #80

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