Fix compile errors on Windows.
GL: Handle multi-line text in label_sizeHint().  Optimize txf_pixelSize().
GL: Fix grid row spacing.
Code examples can be used in cfunc documentation.
Add a bit of function documentation.
Move source files to include/ and eval/ directories.  Remove CMake files.
Update Doxyfile.
Update examples/project.b.
Add execute /err option and eliminate the command argument limit.
Add execute test.
Add read /part option.
Implement "See Also" link generation for cfunc documentation.
Add some more documentation.
Update gl_atoms.
Bump version to 0.2.8.
Add info? function and consolidate with exists? and dir?.
Restore gl/project.b to release mode.
Fix gl/boron-gl.spec for new directory layout.
Document boron_setAccessFunc().
Fix _readPipes to not use FD_ISSET on invalid descriptor.