remake-4.3+dbg-1.6

• Allow --profile to take an argument to specify callgrind for json PR #132 (Jayson Messenger)
• Fix bug in info var PR #113
• Typos in make.1 Issue #110
• Support gcc-10 Issue #109
• Document debugger commands
• Debugger commands are in separate .c files (not inlined, .h included)

I'd like to thank Marten Cassel for his sponsorship.