[PATCH IMPROVED] size reduction for dos2unix and bugfix

[Tito]

Hi,
this patch improves size reduction of dos2unix.c.
Changes are:
1) use of mkstemp.
2) removal of code that tests if a file is already in DOS or unix
    format so that it is not necessary to touch it .
3) a few minor tweaks.
4) fixes a bug in getopt_ulflags switch position that makes  command line
    switches do the opposite of what they are expected to do
	/* -u convert to unix */
	/* -d convert to dos  */ 
5) adds the shorter license.
6) improved comments.
7) minor coding style changes.

Size reduction now is:

  795       0       4     799     31f coreutils/dos2unix.o.orig
  465       0       0     465     1d1 coreutils/dos2unix.o


Tested, seems to work  ;-) 
Please apply.

Ciao,
Tito
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