added copy.txt
Revert "added copy.txt"

This reverts commit 952c27872ed26b2ed5ed6801b835d118b57bd06e.
added trialfolder
added trial2 to folder
edited issue2.txt deleted trial2doc
edited issue2.txt
added issue3
added issue4
Merge branch 'issue4' into dev_2.1
Merge branch 'dev_2.1'