Do price rounding better in sai_maker_otc.py

[ghost]

Due to precision issues, the price rounding mechanism currently used in sai_maker_otc.py doesn't guarantee that a price will always be displayed with the required number of decimal places (e.g. in the Oasis frontend). It may be preferable to round the quantities as well (but to a different number of digits) in order to achieve a consistent number of decimal places.

Authored by @livnev, moved from: makerdao/pymaker#35.

[adamjsawicki]

@reverendus Can this be closed? Doesn't look like this file exists in either repo.

[ghost]

@swixx I think this was about this flag https://github.com/makerdao/market-maker-keeper/blob/master/market_maker_keeper/oasis_market_maker_keeper.py#L111 which doesn't seem to be used for anything anymore. So I would say the issue can be closed as it's about a non-existent feature. Having said that it would be nice to remove the flag as well.