It is "template library", not "tools"

Change-Id: I5ca7b0a0374a9ed0090413e8c6045e5d13097301

o3tl/README

 Very basic template functionality, a bit like boost or stl, but specific to LibO
 
-o3tl presumably stands for "OOo [o3, get it?] tools"
+o3tl stands for "OOo [o3, get it?] template library"
 
 From [http://blog.thebehrens.net/2006/01/15/update-cow_wrapper-is-available-now/]
 The scope for o3tl is admittedly kind of ambitious, as it should contain "...very basic (template)