Changed UFW hint only.
Fixed format of the generated file name.

The sprintf pattern did not produce the desired file name pattern, now the name
has always the same length and the files are listed in chronological order
when using lexical ordering.
Workspace numbers start with zero instead of one.

Removed the previous "correction" of numbering (+1).
Leave the wmctrl workspace numbers unchanged.
Improved start of gpg and ssh agents.

Previously the agents have not been started without a tty connected. Now the
tty dependency is restricted to the part that really needs a terminal: the
ssh-add command. Without a tty this is skipped and can be done later.