Preparing beta version for new dragonfly model, modifications to routings, adding documentation for generating config files, adding libtools to support C++ code compilation

Bug fixes in different network models.

Change-Id: I2d673f6b4925e97efd79f3e383607068914cf78e

See merge request !13

Change-Id: I2d673f6b4925e97efd79f3e383607068914cf78e

Change-Id: I2b2fb4c746fa26097110f08d211c28076fd81942

Adding first pass of dragonfly custom model: routings (adaptive, progressive adaptive, minimal, non-minimal) should be functional with DF traces, need to update for making optimistic mode functional

-- Make all functions static
-- Bug fix in packet_arrive
-- Change ts calculation in packet_send

Change-Id: I2bba1c074ebf0dc641ca025916d9a689d4807731

- Fat Tree readme now includes documentation for the custom- "pruned"
fat tree layout which is used to create the Summit network.

 - Pulling in updates for custom fat tree type appropriate for Summit system

 - Pulling in Jens/Nikhil Fat Tree static routing from remote codes-fattree repo

Documentation in src/networks/model-net/doc/README.fattree.txt

This commit is joint work by Jens Domke and Nikhil Jain.

Jens did all the ground work for dumping the topology and reading the routing
tables. He also wrote the scripts that perform the intermediate steps that
generate the routing tables using the topology.

Nikhil integrated Jens's changes into CODES by breaking them into a 3 step
process as described in src/networks/model-net/doc/README.fattree.txt.

Change-Id: I1478fb2ab83b9ded0673d8f897e09a423868795a

- Update routing algorithm to take into account new custom- mapping
between L1 and L2 switches
- Added total finished packets to stats collection file
- Updates to layout connections output for visualization