e-c-m 1.6.1

[Alex Merry]

Hi David,

I'd like to have a 1.6.1 release of extra-cmake-modules, and 1.6.0 has a 
couple of issues with KDEInstallDirs that are causing existing projects to 
fail to build. In particular, I would like to include:

commit 4462e9ddedb78c31a6f1089d073b1bfde6ce60ce
Author: Alex Merry <alex.merry at kde.org>
Date:   Sun Jan 11 10:57:17 2015 +0000

    Do not unset cache variables in KDEInstallDirs.

commit d47ef4776d349110988477ea1836d98a9e393755
Author: Christoph Cullmann <cullmann at kde.org>
Date:   Wed Jan 7 20:16:23 2015 +0100

    fix typo that lead to nearly empty KDE_INSTALL_TARGETS_DEFAULT_ARGS var on 
mac

The changelog (once again, I forgot about the CHANGELOG keyword until too 
late) would be:

* Fix building projects that use both GNUInstallDirs and KDEInstallDirs in 
different subdirectories by not unsetting cache variables in KDEInstallDirs.
* Fix KDE_INSTALL_TARGETS_DEFAULT_ARGS value on OSX.

How straightfoward would this be to do? I'd be willing to do it myself if 
there's a checklist somewhere of things to do.

Alex