documentation overhaul (#353)

* ident
* remove $Id$ tags from rcs software which has been retired
* make an effort to sync required mib docs with actual code
* sync even more docs with what code actually does
* some whitespace nits
* fixup example to use snmpv2 for all but the most ancient devices
* remove blurb to find more specific snmp::info classes for classes
  which alrdy are as specific as they can get (eg snmp::info::layer3::vmware
  doesn't need info on to find a specific module since there ain't none)
* rename all sub {vendor} strings to lowercase vendor, if cisco, juniper
  and arista can be lowercase, so can be all the rest.
* fix tests
* spread some use warnings around
* use $ instead of @
* remove defines that are included via parent classes
* use strict + warnings
* remove alrdy included modules
* add comma after last list item
* typos
* mibs are found in our mib repo, not on the cisco site
* documentation fixes

lib/SNMP/Info/Layer1/Bayhub.pm

@@ -1,5 +1,4 @@
 # SNMP::Info::Layer1::Bayhub
-# $Id$
 #
 # Copyright (c) 2008 Eric Miller, Max Baker
 # All rights reserved.
@@ -31,13 +30,14 @@
 package SNMP::Info::Layer1::Bayhub;
 
 use strict;
+use warnings;
 use Exporter;
 use SNMP::Info::SONMP;
 use SNMP::Info::NortelStack;
 use SNMP::Info::Layer2;
 
 @SNMP::Info::Layer1::Bayhub::ISA
-    = qw/SNMP::Info::SONMP SNMP::Info::NortelStack  SNMP::Info::Layer2 Exporter/;
+    = qw/SNMP::Info::SONMP SNMP::Info::NortelStack SNMP::Info::Layer2 Exporter/;
 @SNMP::Info::Layer1::Bayhub::EXPORT_OK = qw//;
 
 our ($VERSION, %FUNCS, %GLOBALS, %MIBS, %MUNGE);
@@ -505,11 +505,6 @@ Provides abstraction to the configuration information obtainable from a
 Bay hub device through SNMP.  Also provides device MAC to port mapping through
 the proprietary MIB.
 
-For speed or debugging purposes you can call the subclass directly, but not
-after determining a more specific class using the method above.
-
-my $bayhub = new SNMP::Info::Layer1::Bayhub(...);
-
 =head2 Inherited Classes
 
 =over