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.
Added a __gc metamethod to take care of the finalization of active
connections by logging out, when an account is deleted, or at the end of
the configuration (for Lua 5.2).
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.
Correct the functionality that provides monitoring of the current
selected mailbox in each account, where the wrong variable was written.
Simplify and clarify the code around this functionality.
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.
