Rewrite decode to use Taggish. Squashed commits:

commit 71c06c1352372b8ce43e8ea7b76cd97603528da2
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 14:55:16 2012 +1100

    tagOID, exit on unhandled tags

commit a82a4e7037114532e50a020536c5a824eaab5a44
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 14:43:38 2012 +1100

    tagOID - as a TODO

commit a9f4c89cf76aff411a9aac1a7d24e231064b6027
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 14:21:15 2012 +1100

    TagNoSuchInstance, TagNoSuchObject

commit 2b9e569b59f683155d2b6775e7015980a7bfb416
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 14:08:10 2012 +1100

    walker - start comparing numbers

commit 9379ac7b1e135af60c74ce232c05826790898bde
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 13:53:14 2012 +1100

    decode - integers running

commit 712369c030e3730321118bc79d26d41a9004441a
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 13:13:25 2012 +1100

    octet string running (but some decode diffs)

commit 4e41272cd4c843902ca4e206c0e70cbd7dc9782b
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 12:07:46 2012 +1100

    TagResultNull, TagBoolean working

commit 11afe03e7fd959cc39f56ba70900ea36e9a5c4e4
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 12:06:48 2012 +1100

    compare_single_varbinds SAME/DIFF, since print_varbinds carking

commit 9bf23ef68ddac769efffc240a942200d4185d5b5
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 11:38:42 2012 +1100

    walker - Taggish interface

commit bbfb2fe3e6e0d1f8fe752571e82967cd2bf5ee1b
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 11:38:28 2012 +1100

    Taggish interface

commit 309ee6922229601736278b51515c92007cf663a8
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 11:00:48 2012 +1100

    wip FullDecode - compare_random_varbinds() _compiling_; working?; refactor

commit 36d8825c6ff67bb0b746e881347faa4c3de5afd3
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 10:24:19 2012 +1100

    wip FullDecode - compare_single_varbinds() working

commit e22210b534d9345fe5d8ac9c49aaa2f79958b81b
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 10:08:03 2012 +1100

    don't use DefaultGoSnmp() - just as long as struct literal...

commit 5548b3ff85d4a406d27545fbbf89c40c27b87bb7
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 09:59:36 2012 +1100

    wip FullDecode - get_random_varbinds() working

commit 32a89d57743affcee4c1383b26b48f9feaecd116
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Wed Dec 12 09:52:54 2012 +1100

    wip start on FullDecode

commit c9ca70aaec6a77a985824568f59300d54d6f5565
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Tue Dec 11 15:24:16 2012 +1100

    wip comparing random varbinds

commit 3dce1380bda69b4e0d00379f02b8c45e55744ec4
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Tue Dec 11 15:12:13 2012 +1100

    TagCounter64

commit d864c696404bc4703af06b2202fb8e285bcaa428
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Tue Dec 11 15:01:11 2012 +1100

    compare_random_varbinds() working

commit 2ab36e07ce9752ccaa9c2e27a3c3c5d13e8e1709
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Tue Dec 11 14:47:28 2012 +1100

    update comments/layout main()

commit 472c148be15c56be1cd24f3557578dc2d764345f
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Tue Dec 11 14:45:00 2012 +1100

    use []string not results_t get_*_varbinds - uncouple

commit be093bd721fc1c86e65664f795792efd22b18c9c
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Tue Dec 11 14:38:25 2012 +1100

    netsnmp() -> using_netsnmp() - make code search easier

commit 32d0b18b9b90682adf3b6e0558de188a138eb277
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Tue Dec 11 14:37:02 2012 +1100

    use c.community & c.version with gosnmp!

commit 1bf75580edaa2a24d2a53766cb36a9f544b53c43
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Tue Dec 11 12:18:26 2012 +1100

    wip walker - compare_random_varbinds()

commit 897f9f2d631ab8d40f9175783eaa01993e759e85
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Tue Dec 11 11:50:46 2012 +1100

    chunk snmpget commands - otherwise cmd too long for shell

commit a257f9b9d829dc36acda018b7e0f7d8aac2f1ada
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Tue Dec 11 11:43:57 2012 +1100

    func chunk()

commit 987bb01236a0d5b65658595dd50a73f959cdba3e
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Mon Dec 10 17:57:16 2012 +1100

    ResultNull, split TagNull/NoSuchObject/NoSuchInstance

commit a88c021044c455b52080f395150894db65ec23c9
Author: Sonia Hamilton <sonia@snowfrog.net>
Date:   Mon Dec 10 17:11:30 2012 +1100

    TagNoSuchInstance