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As much of it as possible switch-independant, and put in snmpit_lib.
Should work for arbitrarily complicated switch toplogies, as long as
there are not multiple trunks between two switches. (Multiple ports
combined into one trunk are fine, however.)

As a result of this, VLAN creations and deletions now need to operate
on all switches, not just on the ones that have ports in the VLAN.
This is because the traffic may have to traverse switches that have no
ports in the VLAN to reach other switches that do.

Not called yet. I've done simple testing, but need to do more, as this
could get us into major trouble if it has bugs.

getTrunks: Build a structure representing all of the trunks in the switch
	topolgy
getTrunkPath: Find the shortest path between two switches, across the
	trunks found by getTrunks

Note that the getTrunkPath duplicates some work done in assign. However, we
don't currently have a good way to pass this information from assign to
snmpit, and we need to be able to figure this out anyway, in case snmpit
isn't being called as part of experiment swapin.

These functions should soon be used to pick which VLANs are allowed
across which trunks.

standardize on using /usr/bin/perl instead of /usr/local/bin/perl (most already
did.)

does not yet exist (but should soon.)

There is a new database table, switch_stack_types, that goes along with these
code changes, to indicate which module should be used for each switch stack.

speeds and duplexes from the database.

Make sure experiments actually exist, for morons like me that enter 'eid pid'
instead of 'pid eid'

When using '-t', don't try to create VLANs if they already exist, just
put ports in it (this can be used, for example, to repair damage to switch
state or fix up after manually monkeying with VLANs)

Now supports multiple switches and multiple stacks. To do this, the existing
snmpit_cisco module had to be modified to behave as a true object, and its
interface changed.

A new layer of abstraction has been added: the stack. This is to hide the
details of how things such as VLAN creation occur across multiple devices. For
example, in Cisco stacks, you always contact the stack leader (VTP server) to
create/delete VLANs. Other switches may have different semantics, such as
having to contact every switch to create the VLAN.

Now uses libdb for database access and permissions checks.

Hardware details are hidden as much as possible in the user interface. For
example, the creation and deletion commands now take VLAN identifiers, and
snmpit transparently turns these into device-specific VLAN numbers.

snmpit.in has been re-written from scratch. The new version uses three basic
steps:
1) Process command line options and determine operation to run
2) Determine which devices, ports, and VLANs will be involved and make
   the appropriate objects
3) Actually perform the operation
   when TESTMODE is set, does only steps 1 and 2

Some command-line options have changed. This is because we now use getopt,
rather than a home-grown parser, to parse the command line. As a result of the
large number of options, and an attempt to mimic old options as much as
possible, the options are no longer very mnemonic.

Uses a new table called switch_stacks to figure out which switches belong to
which stacks. A stack is defined as a set of switches that share VLANs.

All snmpit scripts and modules now run with 'use strict' to help catch certain
programming errors.

VLAN listing now prints out the pid/eid and vname for VLANs, if possible.

A few things have bitrotted due to these changes:
* snmpit_intel will need to be re-tooled to use the new interface, and to
  behave as a proper object
* vlansync, vlandiff, and resetvlans depend on the output of snmpit, and will
  need to be updated to understand its new output format

Many changes and updates for handling new types. The db now has types like 'pc600', 'pc850', and 'dnard', and each type has a class like 'pc' or 'shark'. This updates scripts that use types to use classes where appropriate, and to handle the new types where there were hardcoded things that couldn't be eliminated right now.

Changes to snmpit to stop creation/renaming of vlans that already exist, in preparation for vlansync, among other things. Also added vlansync, and made a small change to vlandiff.

Added full support for adding vlans based on the table in the database. Takes pid and eid and sets up the vlans. Added tableVlans to snmpit_lib to get them from the db, and updated snmpit_doc.txt.