Better APIs for good ole WandB

• Just import wandbbq and use wandbbq.init instead of wandb.init.
• If executing an offline run, upon program terination a wandb sync job will be launched to sync your run automatically.
• If the env var WANDBBQ_RELAY is defined as user@ip, wandb sync will be executed over ssh on the provided relay (useful for computing clusters with no internet connection on compute nodes).

• The optional relay node must be capable of accessing the same wandb run folder at the same address.
• No fallback if the sync node has no internet.
• No upload of intermediate products (will implement sometimes later).