Release icewm-1.3.11

This is the latest release of the icewm carry-on fork. This is a stable maintenance release and has soaked for a couple of months without further issues. There are still some outstanding issues with this release; however, a number of issues have been addressed since the last release. See the NEWS and ChangeLog files in the release for details. Included in this release is improvements to both the cmake and autoconf build systems. See INSTALL for autoconf build and INSTALL.cmakebuild in the release for instructions. A number of corrections were made, although no major enhancements are included in this release. This carry-on fork is getting popular. I hope you enjoy.