Some of the functionality that was repeated in many places, regarding checks
and printing of informational messages, was replaced with common functions.
The session and selected variables should be reset if there has been a
connection problem or other failure.
The ifcore module methods that rely on the session should only be called
if there is a valid session variable defined.
Instead of the account details, a pointer to the C structure is used in
Lua, stored as light userdata.
The 1.x deprecated configuration format has been removed, partly due to
the above change, and partly because it has been included for long
enough now.
Move the source code to the src dir, the man pages to the doc dir, and
the example configuration files to the samples dir, and update all
relevant files to reflect the changes.
