fixed lots of bugs in the Cwlinux driver
do not emit EAGAIN error on the first retry
made plugin_i2c_sensors a bit less 'chatty'
moved init and exit functions to the bottom of plugin_pop3
git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@453 3ae390bd-cb1e-0410-b409-cd5a39f66f1f