Added option to print link rather than open browser

[keithfma]

Great package!

I added a quick option to print the search link rather than open the browser window directly. I like to have the option to jump to the search results, but would prefer not to do so automatically, or to be prompted at every error. When it is set up this way, I can leave tracestack on all the time without disrupting my normal workflow.

I also looked into printing shortened links (for aesthetics only) using the pyshorteners package, but the API calls were much too slow to be worth it.

The changes are pretty trivial, but I am of course happy to discuss.

Many thanks, Keith