Added .Z archive handling

[vchepkov]

For Solaris packages come in .Z archive, it's a trivial fix to add support for them

[ffrank]

Thanks @vchepkov and sorry again for delays.

Is this still worth pursuing?

[vchepkov]

I am using it on Solaris from my fork, I thought somebody else might need it

[ffrank]

OK, cool.

Some observations:

• this apparently contains the change from #42
• there is a merge from master in your branch
• the branch needs some squashing
• it cannot merge cleanly anymore

Could you do a rebase and take care of the above issues? I would like to commence with a proper review then.

[vchepkov]

Will do

[vchepkov]

It seems impossible to change a branch of the pull request so I will close this PR and open another one

[ffrank]

You can rebuild your branch using git push -f. But sure, opening another PR works.