pmwebd -X (graphite name shortening) mode

["Frank Ch. Eigler" <fche@xxxxxxxxxx>]

Hi -

These patches are for merging minnus' pmwebd graphite
metric-name-shortening logic, including QA & docs.

git://sourceware.org/git/pcpfans.git fche/pmwebd

commit 3aa972a4f575fb4c4cccf4235012fd38c1ee6331
Author: Frank Ch. Eigler <fche@xxxxxxxxxx>
Date:   Sun Dec 27 08:40:18 2015 -0500

    pmwebd: -X (graphite metric name-shortening) mode QA
    
    Tweak minnus' code to pass the 661 tests, and added one to test
    backward-compatibility non-X mode too.  Made -X default via
    pmwebd.options.

commit ace5ec98f590e55576935395bf1f7863616f6d3b
Author: Frank Ch. Eigler <fche@xxxxxxxxxx>
Date:   Sun Dec 27 08:37:30 2015 -0500

    pmwebd man: tweak
    
    Clarify -X and -P option language.

commit 95c259ba79759c417bf93fc1651c30afd6ac8ab2
Author: Martins Innus <minnus@xxxxxxxxxxx>
Date:   Tue Oct 20 16:39:38 2015 +0000

    pmwebapi : add missing extern in header

commit c672ab3382e187ae13bdbc8b6ca31dd960e45675
Author: Martins Innus <minnus@xxxxxxxxxxx>
Date:   Fri Oct 16 16:17:21 2015 +0000

    Add a command line option to pmwebd for name encoding

commit b32dd96bffca6a28c1d660904633cc74410001de
Author: Martins Innus <minnus@xxxxxxxxxxx>
Date:   Thu Oct 15 18:35:51 2015 +0000

    Start at changing QA 661 for pmgraphite names

commit ecdead19bb44c5004bb55de4c30e96542ba80bdd
Author: Martins Innus <minnus@xxxxxxxxxxx>
Date:   Thu Oct 8 17:46:33 2015 +0000

    Test with changing the way pmwebd provides strings to graphite
    
    Graphite/grafana now seem to tolerate some more special characters.
    Try to not escape them to see if archive and metrics names can
    display closer to their true names.