Fixed error reporting on debugging non-existing file.
Fixed complex values 'captured' by redirected 'print' and not collected.
Expose set_breakpoint as a public API to the app being debugged
set_breakpoint renamed to setbreakpoint.
added mobdebug.removebreakpoint too.
Merge https://github.com/adamdmoss/MobDebug

Conflicts:
	src/mobdebug.lua