[avr,committed] Some no-op changes: Typo, Add copyright notices, Coding rules, Trailing blanks, etc.

[Georg-Johann Lay]

Added copyright notices (avr-lib.h, avr-modes.def):

http://gcc.gnu.org/viewcvs?view=revision&revision=195143
http://gcc.gnu.org/viewcvs?view=revision&revision=195145

Fix typos, remove trailing blanks, coding rules, ...

http://gcc.gnu.org/viewcvs?view=revision&revision=195151