It's possible the location of a source file is not in the
location that gdb thinks. Seer now allows to load the source
file from an alternate directory using the Ctrl^O key while
in the code editor.
Code was calling QFontMetrics::width(), which is deprecated.
Changed code to QFontMetrics::horizontalAdvance().
Added missing include file for QPainterPath.
Added 'install' target to CMakeLists.txt