* gerbv.c: Rework project filename saving to save all layers with relative
pathnames, relative to the project file location. This allows projects
to be relocated, and fixes the second half of bug#
1443885.
* gerbv.c: More work on command line parsing.
* interface.c, render.c, callbacks.c: Reimplement different rendering modes
into the sidepane combobox for GDK. For cairo, allow the user to change the
quality vs speed.
* pick-and-place.c, draw.c: Correct pick and place parsing to use inches
for the basic unit. Render names of pick-and-place components to help
check placement.