Better support of random displacements

[atztogo]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 36.84211% with 36 lines in your changes missing coverage. Please review.

Project coverage is 64.93%. Comparing base (a77b73a) to head (a1a92ed).
Report is 12 commits behind head on develop.

Files	Patch %	Lines
phono3py/file_IO.py	0.00%	17 Missing ⚠️
phono3py/cui/create_supercells.py	18.18%	9 Missing ⚠️
phono3py/cui/phono3py_script.py	62.50%	6 Missing ⚠️
phono3py/cui/show_log.py	75.00%	3 Missing ⚠️
phono3py/cui/load.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #259      +/-   ##
===========================================
+ Coverage    64.28%   64.93%   +0.64%     
===========================================
  Files           74       74              
  Lines        12877    12912      +35     
===========================================
+ Hits          8278     8384     +106     
+ Misses        4599     4528      -71     

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