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BUG: account_needs_update now set to True when performance needs update

Previously we did not update our account information sufficiently often,
which meant results could be inconsistent when referencing context.account
in the handle_data method.

When we call get_account from from the market and minute close methods,
we set the performance_needs_update parameter to False since we just
updated performance.

_get_account is renamed to _update_account since the method does not
return account information.

Also remove redundant asset_needs_update = True lines.