Simplify decompress function

[sigmaSd]

While working on #195 I felt that there is a lot of complexity in certain part of the code-base

This can be dangerous since ouch manipulates files and directories

This an attempt to simplify decompress function

One thing I would want is if we agree on some terminology and write it somewhere, for example the word file is used everywhere but sometimes it means directories, and I really want a name for single file format archive and the other type, etc

[marcospb19]

One thing I would want is if we agree on some terminology and write it somewhere, for example the word file is used everywhere but sometimes it means directories, and I really want a name for single file format archive and the other type, etc

I mean, we accept files as input, but directories are files too.

The correct way to differentiate, in my opinion, is that a "file" can be a "regular file" or a "directory".

I used to call those formats "Single file formats", but you can call them "non-archive formats" too, although I think that "single file format archive" that you said does not make sense, they are not archives because archives have support to bundle multiple files inside of it.

I think of it this way: single file formats do not accept directories because they can contain multiple files inside.