Deprecate export to KML files

Related to #3983, see discussion there for the rationale.

travis/linux/before_install.sh

@@ -10,7 +10,6 @@ sudo apt-get install -qq qt5-default qt515base qt515tools qt515serialport\
 
 sudo apt-get install -qq libglu1-mesa-dev
 sudo apt-get install -qq libsamplerate0-dev
-sudo apt-get install -qq libkml-dev
 sudo apt-get install -qq libical-dev
 
 # Add VLC 3

travis/linux/before_script.sh

@@ -27,8 +27,6 @@ sed -i "s|#\(DEFINES += GC_VIDEO_VLC.*\)|\1|" src/gcconfig.pri
 sed -i "s|#\(DEFINES += GC_WANT_R.*\)|\1|" src/gcconfig.pri
 # Enable CloudDB
 sed -i "s|^#CloudDB|CloudDB|" src/gcconfig.pri
-# LIBKML
-sed -i "s|#\(KML_INSTALL =\).*|\1 /usr|" src/gcconfig.pri
 # D2XX
 sed -i "s|#\(D2XX_INCLUDE =.*\)|\1 ../D2XX/release|" src/gcconfig.pri
 # SAMPLERATE

travis/osx/before_install.sh

@@ -13,8 +13,6 @@ brew install libical
 brew upgrade libusb
 brew install libsamplerate
 rm -rf '/usr/local/include/c++'
-## Disable KML for now
-## brew install --HEAD travis/libkml.rb
 sudo chmod -R +w /usr/local
 
 # R 4.1.1

travis/osx/before_script.sh

@@ -37,9 +37,6 @@ sed -i "" "s|#\(SRMIO_INSTALL =.*\)|\1 /usr/local|" src/gcconfig.pri
 sed -i "" "s|libftd2xx.dylib|@executable_path/../Frameworks/libftd2xx.1.4.24.dylib|" src/FileIO/D2XX.cpp
 sed -i "" "s|#\(D2XX_INCLUDE =.*\)|\1 ../D2XX|" src/gcconfig.pri
 sed -i "" "s|#\(D2XX_LIBS    =.*\)|\1 -L../D2XX -lftd2xx|" src/gcconfig.pri
-## Disable KML for now
-#sed -i "" "s|#\(KML_INSTALL =\).*|\1 /usr/local|" src/gcconfig.pri
-#sed -i "" "s|#\(KML_LIBS    =.*\)|\1 -L/usr/local/lib -lkmlxsd -lkmlregionator -lkmldom -lkmlconvenience -lkmlengine -lkmlbase -lexpect|" src/gcconfig.pri
 sed -i "" "s|#\(ICAL_INSTALL =.*\)|\1 /usr/local|" src/gcconfig.pri
 sed -i "" "s|#\(ICAL_LIBS    =.*\)|\1 -L/usr/local/lib -lical|" src/gcconfig.pri
 sed -i "" "s|#\(LIBUSB_INSTALL =\).*|\1 /usr/local|" src/gcconfig.pri