TODO: added entry

git-svn-id: svn://scm.gforge.inria.fr/svn/mpc/trunk@1252 211d60ee-9f03-0410-a15a-8952a2c7a4e4

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+From Andreas Enge 27 August 2012:
+Implement im(atan(x+i*y)) as
+1/4 * [log1p (4y / (x^2 +(1-y)^2))]
+(see http://lists.gforge.inria.fr/pipermail/mpc-discuss/2012-August/001196.html)
+
 From Andreas Enge 23 July 2012:
 go through tests and move them to the data files if possible
 (see, for instance, tcos.c)