OTX: Revert Linux builds to QT 597 to fix pressure loss

Author: manongjohn

ci-scripts/linux/travis-build.sh

@@ -3,7 +3,7 @@ pushd thirdparty/tiff-4.0.3
 CFLAGS="-fPIC" CXXFLAGS="-fPIC" ./configure --disable-jbig && make
 popd
 cd toonz && mkdir build && cd build
-source /opt/qt514/bin/qt514-env.sh
+source /opt/qt59/bin/qt59-env.sh
 cmake ../sources \
     -DWITH_SYSTEM_SUPERLU:BOOL=OFF
 # according to https://docs.travis-ci.com/user/ci-environment/#Virtualization-environments

ci-scripts/linux/travis-buildpkg.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-source /opt/qt514/bin/qt514-env.sh
+source /opt/qt59/bin/qt59-env.sh
 
 echo ">>> Temporary install of OpenToonz"
 export BUILDDIR=$(pwd)/toonz/build

ci-scripts/linux/travis-install.sh

@@ -1,8 +1,8 @@
-sudo add-apt-repository --yes ppa:beineri/opt-qt-5.14.1-xenial
+sudo add-apt-repository --yes ppa:beineri/opt-qt597-xenial
 sudo add-apt-repository --yes ppa:achadwick/mypaint-testing
 sudo add-apt-repository --yes ppa:litenstein/opencv3-xenial
 sudo apt-get update
-sudo apt-get install -y cmake liblzo2-dev liblz4-dev libfreetype6-dev libpng-dev libegl1-mesa-dev libgles2-mesa-dev libglew-dev freeglut3-dev qt514script libsuperlu-dev qt514svg qt514tools qt514multimedia wget libusb-1.0-0-dev libboost-all-dev liblzma-dev libjson-c-dev libmypaint-dev libjpeg-turbo8-dev libopencv-dev libglib2.0-dev qt514serialport
+sudo apt-get install -y cmake liblzo2-dev liblz4-dev libfreetype6-dev libpng-dev libegl1-mesa-dev libgles2-mesa-dev libglew-dev freeglut3-dev qt59script libsuperlu-dev qt59svg qt59tools qt59multimedia wget libusb-1.0-0-dev libboost-all-dev liblzma-dev libjson-c-dev libmypaint-dev libjpeg-turbo8-dev libopencv-dev libglib2.0-dev qt59serialport
 
 # someone forgot to include liblz4.pc with the package, use the version from xenial, as it only depends on libc
 wget http://mirrors.kernel.org/ubuntu/pool/main/l/lz4/liblz4-1_0.0~r131-2ubuntu2_amd64.deb -O liblz4.deb