Update ledger entry CSV export query to make clearer and add the maker rebate

[gordsport]

Issue

During initial testing of the first mainnet market it has been identified that we need to make some updates to the ledger entry CSV export:

Required for 0.71.x patch:

• remove the \x from the IDs in the CSV
• add the following missing fields to the CSV:
  • MTM gains and losses
  • Any original deposits of assets
  • maker rebate (thats not shown)
• update the account types as these are enums and ideally should be user readable as account types

Other points to consider:

• NICE TO HAVE (possible new ticket to be raised - if not simple/low risk for the patch): Its not particularly easy to be able to work out the in/out accounting for auditing purposes. Can any enhancements be made to help users do their accounting e.g., positive and negative numbers so summing is easier.
  • can we have a column e.g., net that shows positive/negative values or 0 if the transfer is between accounts on the same public key

[pscott31]

the most important thing here is to show ledger entries in/out of a parties' accounts, currently we only show entries out