File Indexing

[teodosin]

Graph needs a function for indexing a single files' connections. This function needs to:

• Take a NodePath as input
• If that input node is a directory, look at all contained paths
• For each contained path, check if there is a node in the db. If not, create it.
• Look at the input node's connections in the db
• If the db node is physical, but the path it's referring to no longer exists, mark the db node as dead (let's not be hasty with deletions just yet)

Could have a separate function that cleans up dead db nodes.