Patch from Egmont Koblinger to implement two extended variants of

Patch from Egmont Koblinger to implement two extended variants of
xterm mouse tracking, both supported by the current up-to-date xterm
(288). They take the form of two new DEC terminal modes, 1006 and
1015, which do not in themselves _enable_ mouse tracking but they
modify the escape sequences sent if mouse tracking is enabled in the
usual way.

git-svn-id: http://svn.tartarus.org/sgt/putty@9752 cda61777-01e9-0310-a592-d414129be87e