Clean up of Tranport Analysis & subgraph

[Richard-Deuchler]

This is a "clean up" ticket. Low priority at the moment.

I corrected the issues that showed up in the initial [building of the transport subgraph](https://github.com/quintel/refinery/issues/13#issuecomment-21259086():

The Transport Analysis (Excel, on Dropbox) now has parent_shares and the spelling issues related to network_gas are fixed. This concerns the transport_edges.csv file.

I also noticed that a file was named incorrectly. transport_final_demand_compressed_network_gas_parent_share should be called: transport_road_compressor_network_gas_parent_share.csv. I have corrected this in Excel on Dropbox.

When the subgraph for transport is updated in the future,

• the definition of edges needs updating (because of the child/parent confusion)
• all shares need updating (correction of child_shares/parent_shares), see example
  • there is a misnamed file needs to be replaced with transport_road_compressor_network_gas_parent_share

[Richard-Deuchler]

The transport sub-graph is calculated completely - closing