Taking image size into account in computing the integration boundary
Avoid the grid points near the outer boundary
Clean up getdt()
Restore the access to outer grid points
Capture SIGINT so we can clean up the GPU task(s) before exiting
Capture SIGTERM because bkill will send it after sending SIGINT
Make sure that the pixels near the four corners get evolved
Can there be compiler bugs in structure padding?  Simplify State
Use c.n_nu instead of N_NU in getdt() and rhd()
Fix bug: initialize I and tau to zero
Configure beta threshold at runtime
c.threshold is defined as 1 / beta_threshold
Merge branch 'develop' into master
Enable extra warnings but disable the unused-function warning
Check return values of fread() and fscan() so glib doesn't complain
Merge branch 'develop' into master
Enable OpenGL extensions on Linux
Use pkg-config only if "glfw3.pc" is covered by PKG_CONFIG_PATH