fix missing register for atmega168p/328p and rfm12_fs20
Merge pull request #343 from AnDann/fix_missing_reg

fix missing register for atmega168p/328p and rfm12_fs20
updated IRMP to rev 143
fixed C&P error
updated profiles
fixes issue #346
Merge pull request #347 from eku/lome6_fix

fix for issue #346
Merge pull request #341 from eku/irmp

updated IRMP to rev 143
vfs_open/vfs_unlink will the file found first in any VFS device
ds1307 datasheet:
A master must signal an end of data to the slave by not generating
an acknowledge bit on the last byte that has been clocked out of
the slave.
no need to block interrupts between i2c read and writes
coding style
vfs_create will use the first VFS device that is writeable
byte order is little endian - bit7 comes last
e6 issue 344 - changes and cleanup for proper handling of the different debug output choices
re-indented config.in using tabs instead of spaces
added/updated debugging options help
made get_usart_count work again for MCUs that define UDR instead of UDRn, e.g. ATmega32
source osdefaults.sh, gawk compat
missing init of debug_out_choices if no usart is available