Sun, 20 May 2018 22:10:30 +0100 paulson merged
Sun, 20 May 2018 22:10:21 +0100 paulson correcting the statements of the MVTs
Sun, 20 May 2018 20:14:30 +0100 paulson one last fix
Sun, 20 May 2018 18:37:34 +0100 paulson tidy up of Derivative
Sun, 20 May 2018 22:04:46 +0200 wenzelm avoid undeclared frees;
Sun, 20 May 2018 22:04:17 +0200 wenzelm removed junk;
Sun, 20 May 2018 21:12:23 +0200 wenzelm avoid dangling tfrees;
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