[PATCH] New check and updates in check_GNU_style script

[Yury Gribov]

Hi all,

Attached patch adds new check (all blocks of 8 spaces are replaced with 
tabs) to contrib/check_GNU_style.sh. It also changes the script to allow 
reading patches from stdin and improves the "Dot, space, space, new 
sentence." check.

-Y
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