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.