[ANN] Clue release 4

[Reuben Thomas <rrt@...>]

This release of my minimal Lua 5.1 to C binding makes two small
improvements: first, the setup macro CLUE_DECLS is split into
CLUE_DEFS (to reserve storage) and CLUE_DECLS (to declare the global
variable(s)); secondly, the main macro CLUE_DO asserts that the given
code compiles and runs without error. This avoids a nasty type of bug
where buggy Lua code's silent failure would cause the C caller to
malfunction later, with no obvious sign that the error was in the Lua
code. As a result, CLUE_DO no longer has a return code (which I found
I almost always ignored, being lazy).

I continue to find Clue a useful tool while translating C into Lua. Get it from:

http://luaforge.net/projects/clue/

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