SSL CTXs should be created after the SSL library initialization, and be
kept until program termination.
Also, TLS version 1.1 and 1.2 are now supported for secure connections.
There is no point in having SSL/TLS IMAP support as optional, it's as
useful if not more than the the non-encrypted connections.
The Makefile was better organized to make it easier to change some
options during compile.
The SHAREDIR variable passed as configuration option has changed name.
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.
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.
