[Add]增加PositionDetail中的持仓均价和持仓盈亏计算
[Add]增加PositionDetail中的持仓均价和持仓盈亏计算

wisfern/vnpy,harveywwu/vnpy,wisfern/vnpy,andrewchenshx/vnpy,andrewchenshx/vnpy,msincenselee/vnpy,harveywwu/vnpy,wisfern/vnpy,rrrrrr8/vnpy,wisfern/vnpy,msincenselee/vnpy,rrrrrr8/vnpy,vnpy/vnpy,msincenselee/vnpy,andrewchenshx/vnpy,rrrrrr8/vnpy,wisfern/vnpy,harveywwu/vnpy,msincenselee/vnpy,rrrrrr8/vnpy,bigdig/vnpy,rrrrrr8/vnpy,harveywwu/vnpy,vnpy/vnpy,wisfern/vnpy,andrewchenshx/vnpy,harveywwu/vnpy,bigdig/vnpy,bigdig/vnpy,rrrrrr8/vnpy,harveywwu/vnpy,bigdig/vnpy,andrewchenshx/vnpy