How to recover the debian/ dir

[Jianming YOU <youj@fnal.gov>]

Hi, Experts,

I once packaged my own utility using debhelper and the resulted 
myutil_1.0-1.deb was installed succefully.

Now I updated myutil and intent to build myutil_1.1. I could go through the 
same process from dh_make ..... The mentors from this mailing list always 
suggest to copy the debian dir and I understand it will save me a lot of
repeated work. The problem is I did not save the debian dir last time.

How can I recover  the debian dir from myutil_1.0-1.deb ?
I tried "dpkg -X myutil_1.0-1.deb myutil" and recovered the control file.
Is that all? I think the deb file contains all the information needed to 
install a package, like the preinst, prerm,.... Am I missing something?

Another quick question: why does debhelper add "-1" to the version number?

Any information is highly appreciated

-- Jim