Changes after test integration into kernel 2.6.21 :

Changes after test integration into kernel 2.6.21 :

Exported functions in core.h need to be declared 'extern' to avoid the
kernel error "can: exports duplicate symbol can_send (owned by kernel)"
This occures e.g. when can.ko is built-in and the protocol modules are
built as modules.

Made our kernel log messages lower case as other subsystems like USB do.
Changed some kernel messages. Cosmetics.
RFC: Use 20070501 as CAN_VERSION inside the Kernel instead of 2.0.0-pre7?

git-svn-id: svn://svn.berlios.de//socketcan/trunk@255 030b6a49-0b11-0410-94ab-b0dab22257f2