Getting Lua limits via an api

[Dibyendu Majumdar <mobile@...>]

Hi,

I have made good progress running the Lua test suite in Ravi. A big
missing piece was the support for the debug api which I have now
implemented. I am close to being able to run the whole of the test
suite.

One area that I have had to change is wherever a Lua limit is
hardcoded. I think it may be useful to have an api function (I think
the ltests module has one such but it doesn't include all the limits)
- that the test cases could invoke to obtain the limits rather than
these being hardcoded.

Thanks and Regards
Dibyendu