Improve annotations in varinfo debug section decoding
Add tests for integer number constants
Implement decoding of ktab entries in kgc bytecode section
Fix chunkname reported in bytecode to align with LuaJIT

Report the actual filename prepended with a "@".
Fix a problem in framesize determination with return statement

In "expr_tomultireg" when no MultiExprRule is available we need to
increment the framesize to accomodate all the generated expressions.

Note that the current free register should not be incremented, just the
framesize could need to be increased.
Improve the tagging of local function declaration

Avoid flagging a local function declaration variable as "mutable".