cdecl-18.3

no option autocompletion
Since the "no" options are of the form nofoo and not no-foo, if the user types:

cdecl> set no-<tab>

i.e., includes -, it's changed to just "no" so cdecl will still present all the "no" options.

Dynamic __FILE__ & __LINE__ macros
The value of __FILE__ is now the current input file, if any, or stdin. The value of __LINE__ is the line numer within that file, if any.

language option
The lang option has been replaced by language to match the --language command-line option.

Fixed set lang
Giving a value for a language for the set command is now correctly forbidden, e.g.:

cdecl> set c=x
             ^
7: error: "x": set option "c" takes no value

## whitespace
Fixed incorrect deletion of whitespace when concatenating tokens in some cases.

__VA_ARGS__ as ## argument
__VA_ARGS__ as a ## argument is now correctly not further expanded, e.g.:

cdecl> #define XPASTE(...)  x ## __VA_ARGS__
cdecl> expand XPASTE(__LINE__)
...
XPASTE(__LINE__) => x__LINE__

__VA_OPT__ expanding to nothing
When __VA_OPT__ expands to nothing, it needs to expand into a placemarker.

__VA_OPT__ whitespace
Leading & trailing whitespace in __VA_OPT__() tokens is now trimmed, e.g.:

cdecl> #define CALL_QUOTE(x) QUOTE(x)
cdecl> #define QUOTE(X) #X
cdecl> #define TILDAS(...) ~__VA_OPT__( ~ )~
cdecl> expand CALL_QUOTE(TILDAS(x))
...
CALL_QUOTE(~~~) => "~~~"