Fix various things

Change MAXSRC from 80 to 60 (like it is by default in lua)
Errors now use shortsource instead of source
shortsource is more implemented ([string "blah..."])
changed load's error to match lua
Fix debug api returning 0/1 instead of false/true
Removed some hardcoded returns (which gave wrong results)
Don't add "name" if its null
short_src of java functions is now "[JAVA]" which matches Lua's "[C]"

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