Disable the "all" Travis CI job

The job that tests install_ide "all" now usually exceeds the maximum job duration, causing the build to error. The only other option I could see is allowing failure for this job but it increases the build time a lot for something I usually won't bother to check. So I think it's better to just uncomment this line during testing of work that might affect the "all" functionality.

Author: per1234

.travis.yml

@@ -13,8 +13,8 @@ env:
   matrix:
     # Test install_ide with no argument (using full version list). This would cause the Travis CI build to take much longer so I have it disabled
     # - INSTALL_IDE_START_VERSION=""
-    # Test install_ide using full version list
-    - INSTALL_IDE_START_VERSION="all" VERBOSITY_LEVEL=0 VERBOSE_COMPILATION="false"
+    # Test install_ide using full version list. This usually takes longer that the maximum job duration and thus errors the build so it must be disabled.
+    #- INSTALL_IDE_START_VERSION="all" VERBOSITY_LEVEL=0 VERBOSE_COMPILATION="false"
     # Test install_ide using custom version list. Test the use of the special version names "oldest" and "newest" in a version list. Test use of "hourly" version name.
     - INSTALL_IDE_START_VERSION='("oldest" "1.8.1" "1.8.2" "newest" "hourly")' VERBOSITY_LEVEL=1 VERBOSE_COMPILATION="true"
     # Allowed to fail