Add "fast mode" to fpkg

[Boris-Dimov]

It's nice to have the delays in fpkg and all, but sometimes you just want to get things done quick.

I propose we do it the following way: we crate our own function in place of sleep (call it 'sleepy' or sth), which will check if a command-line variable (say 'fast') is present, and call or not call sleep with the appropriate duration.

[Boris-Dimov]

Solved by commit c85cb6a