Merge branch 'v4.4-branch' back into master

The manuals all will need a careful read.
The changes to use lsb-release and the PCLinuxOS specific files got lost
because I didn't want to try to rewite this in the middle of a merge.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

Conflicts:
	Documentation/50-pot/subsurface-manual.pot
	Documentation/fr/po/subsurface-manual.fr.po
	Documentation/user-manual.txt
	Documentation/user-manual_es.txt
	Documentation/user-manual_fr.html.git
	Documentation/user-manual_fr.txt
	Documentation/user-manual_ru.html.git
	Documentation/user-manual_ru.txt
	file.c
	qthelper.cpp
	subsurface.pro
	subsurfacesysinfo.cpp
	xslt/DiveLog.xslt

scripts/build.sh

@@ -0,0 +1,102 @@
+#!/bin/bash
+#
+# this should be run from the src directory, the layout is supposed to
+# look like this:
+#.../src/subsurface
+#       /libgit2
+#       /marble-source
+#       /libdivecomputer
+#
+# the script will build these three libraries from source, even if
+# they are installed as part of the host OS since we have seen 
+# numerous cases where building with random versions (especially older,
+# but sometimes also newer versions than recommended here) will lead
+# to all kinds of unnecessary pain
+
+SRC=$(pwd)
+if [[ ! -d "subsurface" ]] ; then
+	echo "please start this script from the directory containing the Subsurface source directory"
+	exit 1
+fi
+
+# qmake or qmake-qt5 ?
+qmake -v | grep "version 5" > /dev/null 2>&1
+if [[ $? -eq 0 ]] ; then
+	QMAKE=qmake
+else
+	qmake-qt5 -v | grep "version 5" > /dev/null 2>&1
+	if [[ $? -eq 0 ]] ; then
+		QMAKE=qmake-qt5
+	else
+		echo "can't find a working qmake for Qt5"
+		exit 1
+	fi
+fi
+
+mkdir -p install
+
+# build libgit2
+
+if [ ! -d libgit2 ] ; then
+	if [[ $1 = local ]] ; then
+		git clone $SRC/../libgit2 libgit2
+	else
+		git clone git://github.com/libgit2/libgit2
+	fi
+fi
+cd libgit2
+git checkout v0.21.5
+mkdir -p build
+cd build
+cmake -DCMAKE_INSTALL_PREFIX=$SRC/install -DCMAKE_BUILD_TYPE=Release -DBUILD_CLAR=OFF ..
+cmake --build . --target install
+
+cd $SRC
+
+# build libdivecomputer
+
+if [ ! -d libdivecomputer ] ; then
+	if [[ $1 = local ]] ; then
+		git clone $SRC/../libdivecomputer libdivecomputer
+	else
+		git clone -b Subsurface-4.4 git://subsurface-divelog.org/libdc libdivecomputer
+	fi
+fi
+cd libdivecomputer
+git checkout Subsurface-4.4
+if [ ! -f configure ] ; then
+	autoreconf --install
+	./configure --prefix=$SRC/install
+fi
+make -j4
+make install
+
+cd $SRC
+
+# build libssrfmarblewidget
+
+if [ ! -d marble-source ] ; then
+	if [[ $1 = local ]] ; then
+		git clone $SRC/../marble-source marble-source
+	else
+		git clone -b Subsurface-4.4 git://subsurface-divelog.org/marble marble-source
+	fi
+fi
+cd marble-source
+git checkout Subsurface-4.4
+mkdir -p build
+cd build
+cmake -DCMAKE_BUILD_TYPE=Release -DQTONLY=TRUE -DQT5BUILD=ON \
+	-DCMAKE_INSTALL_PREFIX=$SRC/install \
+	-DBUILD_MARBLE_TESTS=NO \
+	-DWITH_DESIGNER_PLUGIN=NO \
+	-DBUILD_MARBLE_APPS=NO \
+	$SRC/marble-source
+cd src/lib/marble
+make -j4
+make install
+
+cd $SRC/subsurface
+$QMAKE CONFIG+=setRpath LIBDCDEVEL=1 LIBMARBLEDEVEL=$SRC/install SPECIAL_MARBLE_PREFIX=1 LIBGIT2DEVEL=$SRC/libgit2 subsurface.pro
+make -j4
+