[WIP] lightweight refactoring#84

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Leo Fang (leofang) wants to merge 4 commits intoNSLS2:masterfrom

leofang:code_struct

Commits on Feb 3, 2020

rearrange code structure
Leo Fang (leofang)
committed

Commits on Feb 4, 2020

Commits on Aug 3, 2020

Merge branch 'master' into code_struct
Leo Fang (leofang)
committed