whitespace and bump copyright
Increase the default (and minimum) buffer size from 4 kB to 16 kB.  Also,
propagate the buffer size to libc, which uses a 1 kB buffer by default,
negating any hypothetical benefit of increasing fetch(1)'s buffer size.

MFC after:	3 days
ext2fs: Use i_flag instead of i_flags for Ext4 inode flags.

The ext4 inode flags do not have equivalents for chflags (1)
and hold information that is private to the implementation.
The i_flag field in the inode is a better place to hold the Ext4
inode flags as it saves us from masking flags while setting or
getting attributes.  It should also make things cleaner if we
implement write support for Ext4.

Suggested by:	bde
Tested by:	Mike Ma
MFC after:	3 days