- tabs removed

- find_tail/head_impl functions rearranged to avoid the dependency problem


[SVN r32676]

libs/algorithm

@@ -1 +1 @@
-Subproject commit fa01964a1f64b0999d31d422e508108618a2ad51
+Subproject commit e2b9172f5d1dc6935693b765ed03a3426ab95236