Minimize 2to3 diffs
Remove redondent test
Implement the CreateDirectory stock action
Ignore error when creating an existing directory
CreateDirectory: accept only "directory exists" failure
Test label of CreateDirectory
Implement CallSubprocess stock action
Refactor tests
Implement DeleteFile stock action
Todo
Remove debug print
Implement CopyFile
Refactor tests
Label for CopyFile
Fix timing tests
Implement TouchFile stock action
Merge branch 'topic/StockActions' into develop
Automaticaly select the appropriate number of jobs
Implement the NullAction stock action
Add begin and end time for canceled actions