Changes to table length

["Soni L." <fakedme@...>]

The first change is to remove length entirely.

Lua 5.0 had a concept of table length (setn). Lua 5.1 had a different 
concept of table length (#). Lua 5.2/5.3 has yet another concept of 
table length (__len).

Note that they are all different concepts. The best way to solve the 
length problem is to remove length entirely.

Let the user and the libraries define how length should be handled. If a 
library wants to add setn, no problem! If a library wants O(n) length 
based on pairs(), no problem! If a library wants O(n) length based on 
ipairs(), no problem! If a library wants O(logn) length based on 
rawget(), no problem! If a library wants O(logn) length based on 
__index, no problem! This also includes the removal of #, obviously.

Some additional benefits include:

If someone wants to replace the whole stdlib just so they can use 
0-based indexing, no problem!

local t = {[0]=1, 2, 3, 4, 5}

print(zerolen(t)) --> 5

The second change is to remove all mentions of table length from the C 
API. The C API shall not rely on table length, ever. Each C API function 
should handle length on its own way. (The lack of consistency *is* a 
consistency in itself.)

I believe these changes will really help w.r.t. arguments about length.

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