some revise
fix bug:改正本地版本无head&tail
Merge branch 'Data' of ssh://github.com/IbpTeam/demo-rio into Data#40_xiquan
folderViewImprovement-wangyu: fix two bugs of folder mode view and make some improvement
1.Modify uniqueID.SetSysUid  2.Generate uniqueID in ~/.demo-rio
Merge pull request #143 from IbpTeam/folderViewImprovement-wangyu

folderViewImprovement-wangyu: ->wangfeng
OK
修改：更改逻辑准备
Merge pull request #144 from v11985/data#40_wangfeng

1.Modify uniqueID.SetSysUid  2.Generate uniqueID in ~/.demo-rio ->xiquan
Data#40_yuanzhe:use uri instead of id when create an new item
Merge branch 'Data' of ssh://github.com/IbpTeam/demo-rio into Data#40_xiquan
Data#40_yuanzhe:change find item api to use uri,modify recent table
fix bug:hastable isExist()
Merge pull request #145 from huyuanzhe/Data#40_yuanzhe

Data#40 yuanzhe -> wangfeng
OK
hashtable imporvement
修改update逻辑：update history适用多有向关系
Merge branch 'Data' of ssh://github.com/IbpTeam/demo-rio into Data#40_xiquan
fix bug
Data#40_yuanzhe:modify api -> find item by uri
addDeleteFunction-wangyu: add delete function to frontend
fix bug