Use verboser installation, check for installed powerline

tests/install.sh

@@ -46,13 +46,13 @@ if test -n "$USE_UCS2_PYTHON" ; then
 	mkvirtualenv -p "$PYTHON" cpython-ucs2-$UCS2_PYTHON_VARIANT
 	set -e
 	. tests/bot-ci/scripts/common/main.sh
-	pip install .
+	pip install --verbose --verbose --verbose .
 	if test "$UCS2_PYTHON_VARIANT" = "2.6" ; then
 		rm tests/bot-ci/deps/wheels/ucs2-CPython-${UCS2_PYTHON_VARIANT}*/pyuv*.whl
 	fi
 	pip install --no-deps tests/bot-ci/deps/wheels/ucs2-CPython-${UCS2_PYTHON_VARIANT}*/*.whl
 else
-	pip install .
+	pip install --verbose --verbose --verbose .
 	# FIXME Uv watcher sometimes misses events and INotify is not available in
 	#       Python-2.6, thus pyuv should be removed in order for VCS tests to 
 	#       pass.

tests/test_in_vterm/test_shells.sh

@@ -62,6 +62,8 @@ if test -e "$ROOT/scripts/powerline" ; then
 	ln -s "$ROOT/scripts/powerline" "$TEST_ROOT/path"
 elif test -e client/powerline ; then
 	ln -s "$ROOT/client/powerline" "$TEST_ROOT/path"
+elif which powerline ; then
+	ln -s "$(which powerline)" "$TEST_ROOT/path"
 else
 	echo "Executable powerline was not found"
 	exit 1