Improve column names of output DataFrame

[misilva73]

The run_sim function return a DataFrame with column names that are not very intuitive. As an example, here are column names of the main components of circulating supply:

• circ_supply
• cum_network_reward
• total_vest
• network_locked
• network_gas_burn

This issue is aimed at improving these column names and making them easier to understand for a user unfamiliar with the package.

[tmellan]

network_gas_burn should probably be network_burn to include penalties also