BTManager 1.3.1

This is mainly a bugfix release, but it includes one new feature: you can now specify an auto-refresh delay for the 'List' tab (in seconds, see in the 'Configuration' tab, 0 means no auto-refresh).

The bugfixes are:

* Windows users:

the default configuration was broken and lead to numerous and almost random error pages.

* All users:

A problem with file names containing non-ASCII characters has been worked around.

People who installed from source will have to update the 'autoweb' package for this fix.