In this way we don't have to duplicate the method everywhere.

 The UnitTest were running on a different folder them expected, causing often erase of the selenium
 setup and others test folders. This were causing over compilation.

Allow to store huge log informations.

Support no content.

Data can only be appended.

Add a test case for one.

Add inline test cases.
Fix several bugs brought up by test cases.
Alter PersistentString instances when they already exist rather than
creating new ones.

LOBTree raises when a key is out of range.

Credit to Vincent Pelletier.

In some cases, listing files is disallowed. Allow caller to disable
paramiko's default-enabled file size check to support these cases.

Drop parameters which are passed with default value.

Requires creating socket outside of paramiko.Transport .