Squeeze blank lines by default for -m output

[thinkerbot]

A limited, informal survey of the default pager for man indicates that squeezing blank lines is typical. The result is a tidier output.

Surveyed:

• Ubuntu pager -s
• OSX less -is
• "Linux" /usr/bin/less -isr

This addresses issue #63.

[thinkerbot]

Note that given the pager is so variable (and the groff options, I bet) I think that generating a tmp file and using man itself would give the best user experience. That way the user would see exactly what they will see if/when they install the manpage on their system.

I looked into bin/ronn to see what that would take. Doesn't seem terribly hard.

[apjanke]

Looks like Ronn development is defunct. But I've made a Ronn-NG fork and done this over there, if you're still interested.