dynamic_debug: add pending queries, etc (~resend)

This is essentially a rebase, resend, with trivial changes:
- drops scx200 - off topic
- adds pr_cont_once tweak - remove pr_fmt
as before, it has:
- Doc tweaks per Randy Dunlap
- pr_fmt_$severity, suggested by Joe Perches
- does not change pr_fmt() default, per Joe

Rebased onto git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
+ Jason's 8-12/12 which havent made it into driver-core
Ive not resent them here.

[jimc@groucho linux-2.6]$ git diff --stat jb-on-driver-core 
 Documentation/dynamic-debug-howto.txt |  334 +++++++++++------
 include/linux/device.h                |    8 +-
 include/linux/dynamic_debug.h         |   23 +-
 include/linux/netdevice.h             |    8 +-
 include/linux/printk.h                |   95 +++--
 lib/dynamic_debug.c                   |  685 +++++++++++++++++++++++++++------
 6 files changed, 866 insertions(+), 287 deletions(-)

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