Revert pathfinding changes:
* 5e7c527 Revert "Fix account_lines, account_offers and book_offers result (RIPD-682):"
* b3417ca Revert "Fix pathfinding with multiple issuers for one currency (RIPD-618)."
* 00db7f5 Revert "Clean up Pathfinder."
Fix account_lines, account_offers and book_offers result (RIPD-682):
The RPC account_lines and account_offers commands respond with the correct ledger info. account_offers, account_lines and book_offers allow admins unlimited size on the limit param. Specifying a negative value on limit clamps to the minimum value allowed. Incorrect types for limit are correctly reported in the result.
Set version to 0.26.4-sp2