Using Python 3.5+ os.scandir() optimized variant.
Starting.
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*Collecting tree differences
Skipping system cruft (metadata) files in both FROM and TO
comparing [/home/name/Desktop/mergeall-3.0-beta/test/test1] [/home/name/Desktop/mergeall-3.0-beta/test/test2]
excluding /home/name/Desktop/mergeall-3.0-beta/test/test2/__bkp__
comparing [/home/name/Desktop/mergeall-3.0-beta/test/test1/d3] [/home/name/Desktop/mergeall-3.0-beta/test/test2/d3]
Phase runtime: 0.0034848889999921084
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*Reporting tree differences
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SAMEFILE DIFFERENCES: (name, dirfrom, dirto, why)
**These items will be replaced in dirto by automatic resolution**

[('f3.txt',
  '/home/name/Desktop/mergeall-3.0-beta/test/test1',
  '/home/name/Desktop/mergeall-3.0-beta/test/test2',
  'modtime'),
 ('f6.txt',
  '/home/name/Desktop/mergeall-3.0-beta/test/test1',
  '/home/name/Desktop/mergeall-3.0-beta/test/test2',
  'filesize'),
 ('f3.txt',
  '/home/name/Desktop/mergeall-3.0-beta/test/test1/d3',
  '/home/name/Desktop/mergeall-3.0-beta/test/test2/d3',
  'modtime'),
 ('.htaccess',
  '/home/name/Desktop/mergeall-3.0-beta/test/test1/d3',
  '/home/name/Desktop/mergeall-3.0-beta/test/test2/d3',
  'modtime')]
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UNIQUE ITEMS IN DIRTO: (names, dirfrom, dirto)
**These items will be deleted from dirto by automatic resolution**

[(['f2.txt', 'd2'],
  '/home/name/Desktop/mergeall-3.0-beta/test/test1',
  '/home/name/Desktop/mergeall-3.0-beta/test/test2'),
 (['f5.txt'],
  '/home/name/Desktop/mergeall-3.0-beta/test/test1/d3',
  '/home/name/Desktop/mergeall-3.0-beta/test/test2/d3')]
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UNIQUE ITEMS IN DIRFROM: (names, dirfrom, dirto)
**These items will be copied over to dirto by automatic resolution**

[(['f1.txt', 'd1'],
  '/home/name/Desktop/mergeall-3.0-beta/test/test1',
  '/home/name/Desktop/mergeall-3.0-beta/test/test2'),
 (['f4.txt'],
  '/home/name/Desktop/mergeall-3.0-beta/test/test1/d3',
  '/home/name/Desktop/mergeall-3.0-beta/test/test2/d3')]
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MIXED MODE NAMES: (name, dirfrom, dirto)
**These items will be replaced in dirto by automatic resolution**

[('m2',
  '/home/name/Desktop/mergeall-3.0-beta/test/test1',
  '/home/name/Desktop/mergeall-3.0-beta/test/test2'),
 ('m1',
  '/home/name/Desktop/mergeall-3.0-beta/test/test1',
  '/home/name/Desktop/mergeall-3.0-beta/test/test2')]
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*Resolving tree differences
Skipping system cruft (metadata) files in FROM folders
....backing up all items to /home/name/Desktop/mergeall-3.0-beta/test/test2/__bkp__/date161015-time141550
replaced same file, using FROM /home/name/Desktop/mergeall-3.0-beta/test/test1/f3.txt
replaced same file, using FROM /home/name/Desktop/mergeall-3.0-beta/test/test1/f6.txt
replaced same file, using FROM /home/name/Desktop/mergeall-3.0-beta/test/test1/d3/f3.txt
replaced same file, using FROM /home/name/Desktop/mergeall-3.0-beta/test/test1/d3/.htaccess
removed old TO file, /home/name/Desktop/mergeall-3.0-beta/test/test2/f2.txt
removed old TO dir, /home/name/Desktop/mergeall-3.0-beta/test/test2/d2
removed old TO file, /home/name/Desktop/mergeall-3.0-beta/test/test2/d3/f5.txt
copied new FROM file, /home/name/Desktop/mergeall-3.0-beta/test/test1/f1.txt
copied new FROM dir, /home/name/Desktop/mergeall-3.0-beta/test/test1/d1
copied new FROM file, /home/name/Desktop/mergeall-3.0-beta/test/test1/d3/f4.txt
replaced file with dir, using FROM /home/name/Desktop/mergeall-3.0-beta/test/test1/m2
replaced dir with file, using FROM /home/name/Desktop/mergeall-3.0-beta/test/test1/m1
Phase runtime: 0.003797452000071644
------------------------------------------------------------------------------- 
*Summary
Compared    => files: 6, folders: 2
Differences => samefile: 4, uniqueto: 3, uniquefrom: 3, mixedmode: 2
Changed:
files   => created: 2, deleted: 2, replaced: 5
folders => created: 1, deleted: 1, replaced: 1
-------------------------------------------------------------------------------
Finished.