QA output created by 435
expect only a few lines of diff output ...

--- gzip first volume ---
> pmdumplog ...
>              Warning: file missing or compressed for log volume 0
> pminfo ...
> pmprobe in the middle ...
> pmval & pmval -r ...
< archive:   src/mv-bigbin
---
> archive:   mv-bigbin
< archive:   src/mv-bigbin
---
> archive:   mv-bigbin
> pmie ...

--- gzip last volume and use existing .9.gz in -a arg ---
> pmdumplog ...
>              Warning: file missing or compressed for log volume 9
> pminfo ...
> pmprobe in the middle ...
> pmval & pmval -r ...
< archive:   src/mv-bigbin
---
> archive:   mv-bigbin.9.gz
< archive:   src/mv-bigbin
---
> archive:   mv-bigbin.9.gz
> pmie ...

--- gzip middle volume and used existing .1 in -a arg ---
> pmdumplog ...
>              Warning: file missing or compressed for log volume 5
> pminfo ...
> pmprobe in the middle ...
> pmval & pmval -r ...
< archive:   src/mv-bigbin
---
> archive:   mv-bigbin.1
< archive:   src/mv-bigbin
---
> archive:   mv-bigbin.1
> pmie ...

--- gzip first, middle and last volume and use .meta in -a arg ---
> pmdumplog ...
>              Warning: file missing or compressed for log volume 0
>              Warning: file missing or compressed for log volume 5
>              Warning: file missing or compressed for log volume 9
> pminfo ...
> pmprobe in the middle ...
> pmval & pmval -r ...
< archive:   src/mv-bigbin
---
> archive:   mv-bigbin.meta
< archive:   src/mv-bigbin
---
> archive:   mv-bigbin.meta
> pmie ...

--- gzip first few, middle and last few volumes and use existing .7.gz in -a arg ---
> pmdumplog ...
>              Warning: file missing or compressed for log volume 0
>              Warning: file missing or compressed for log volume 1
>              Warning: file missing or compressed for log volume 5
>              Warning: file missing or compressed for log volume 7
>              Warning: file missing or compressed for log volume 8
>              Warning: file missing or compressed for log volume 9
> pminfo ...
> pmprobe in the middle ...
> pmval & pmval -r ...
< archive:   src/mv-bigbin
---
> archive:   mv-bigbin.7.gz
< archive:   src/mv-bigbin
---
> archive:   mv-bigbin.7.gz
> pmie ...

--- some error cases ---
pminfo: Cannot open archive "mv-bigbin.10": No such file or directory
pmprobe: Cannot open archive "mv-bigbin.10": No such file or directory
pmval: Cannot open archive "mv-bigbin.10": No such file or directory
pmie: cannot open archive mv-bigbin.10
pmNewContext failed: No such file or directory
pminfo: Cannot open archive "mv-bigbin.10.gz": No such file or directory
pmprobe: Cannot open archive "mv-bigbin.10.gz": No such file or directory
pmval: Cannot open archive "mv-bigbin.10.gz": No such file or directory
pmie: cannot open archive mv-bigbin.10.gz
pmNewContext failed: No such file or directory
gzip: ./null.0.gz: unexpected end of file
pminfo: Cannot open archive "null": Corrupted record in a PCP archive log