cosFileTransfer: Remove VxWorks
Merge branch 'maint'

Conflicts:
	lib/diameter/autoconf/vxworks/sed.general
	xcomp/README.md
Implement ./otp_build configure --enable-silent-rules

With silent rules, the output of make is less verbose and compilation
warnings are easier to spot. Silent rules are disabled by default and
can be disabled or enabled at will by make V=0 and make V=1.
Update copyright years
Prepare release
Update copyright years
Remove unused Postscript files