create output subdirectory automatically or manually

[masayoshi-ogura]

Previously, this program create output subdirectory named with datetime (ex. output/1122-134738) automatically.
There was a problem that it was hard to understand the contents of a output subdirectory, and it was hard to access with TAB completion.

Now, this program does not create any subdirectory in out_dir set by configuration file.
So all output files will be overwritten if you forget to change the out_dir variable.

I want to know what specification of output directory you prefer to use.

For example, I am considering the following specifications:

• by default, create subdirectory named with datetime
• with commandline option --tag TAG or -t TAG, create subdirectory name with TAG