validate coordinates for single-pixel writes

in the long run, we need to check our painting directives since this is quite expensive
Merge pull request #62 from hwhw/master

validate coordinates for single-pixel writes
looks as if DjVuLibre was migrated to SF's new platform
Merge pull request #63 from hwhw/master

looks as if DjVuLibre was migrated to SF's new platform
Add some methods useful for standby support.
Merge pull request #64 from giorgio130/master

Add some methods useful for standby support in Kobo.
fix buggy C-style comparison of integer value

in Lua land, "if 0 then X end" does execute X.
Merge pull request #65 from hwhw/fix-blitbuffer

fix buggy C-style comparison of integer value