The virtual imaplib2 first try to import imaplib2 when provided by the system.
If not provided or if the version is not supported, fallback on the bundled
imaplib2 version.
Distribution maintainers can now easily remove the bundled imaplib2 version if
they want to get it packaged outside of offlineimap.
We still want to provide imaplib2 by default because:
- this library is neither in Python core nor packaged by a lot of distributions;
- users expect to be able to run offlineimap by just downloading the tarball or
after a git clone.
In order to avoid unexpected (too old) versions of imaplib2, we restrict the
supported versions of this librabry.
Reviewed-by: Łukasz Żarnowiecki <dolohow@outlook.com>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>
