[#2482] Add prefix/suffix for creareFolder add writeFileContent.

Problem
======

It would be nice to add a prefix on temp folders so that when debuging is much easier to identify their purpose.

Changes
=======

Add prefix and suffix to tempFolder just like we have for tempFile

As a drive by add a helper method to write content to a file.

How to test
========

reviewers: @alibotean 

check that changes make sense.

I had to release 0.30.1 since for first release I forgot to merge master.

thanks!
I was having a WTF moment for this call, while use `content` twice. Does it work? :smile:

```
def openFileForWriting(self, segments, utf8=False):
   [...]
```