Ditz issue update
Add limit defs for types like duk_uarridx_t

These are needed for some assertions.
/Wp64 fixes for VS2010 on x86
Regexp compiler /Wp64 fixes
/Wp64 portability note to guide
Release note update
A few more /Wp64 fixes
Merge branch 'wp64-x86-fixes'
Ditz issue update