refactor: move DEPRECATED, export et.al. from base to debug.

* specs/base_spec.yaml (export, DEPRECATED): Move from here...
* specs/debug_spec.yaml (export, DEPRECATED): ...to here.
* specs/base_spec.yaml: Remove unused file.
* specs/specs.mk (specl_SPECS): Remove specs/base_spec.yaml.
* lib/std/base.lua (DEPRECATED, DEPRECATIONMSG, argcheck)
(argerror, arglen, argscheck, export, getcompat, setcompat)
(toomanyarg_fmt): Move from here...
* lib/std/debug.lua (DEPRECATED, DEPRECATIONMSG, argcheck)
(argerror, arglen, argscheck, export, getcompat, setcompat)
(toomanyarg_fmt): ...to here.  Adjust all callers.
* lib/std/base.lua (argpairs, checktype, concat, formaterror)
(getfenv, getinfo, match, merge, normalize, permutations)
(setfenv, whatpath): Move from here...
* lib/std/debug.lua (argpairs, checktype, concat, formaterror)
(getfenv, getinfo, match, merge, normalize, permutations)
(setfenv, whatpath): ...to here, but elide their definitions
if _DEBUG.argcheck is false, or equivalent.
* NEWS: Update.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>

Author: gvvaughan

NEWS

@@ -13,9 +13,13 @@ Stdlib NEWS - User visible changes
  - New `debug.argscheck` function for checking all function parameter
    types with a single function call in the common case.
 
- - New `_DEBUG.argcheck` field that disables `debug.argcheck` (and
-   `debug.argscheck`) for production code.  Similarly `_DEBUG = false`
-   disables those functions too.
+ - New `debug.export` function, which returns a wrapper function for
+   checking all arguments of an inner function against a type list.
+
+ - New `_DEBUG.argcheck` field that disables `debug.argcheck`,
+   `debug.argscheck` and changes `debug.export` to return its function
+   argument unwrapped, for production code.  Similarly `_DEBUG = false`
+   deactivates these functions in the same way.
 
  - New `std.vector` object, for clean and fast queue-like or stack-like
    container management.  When alien is installed, and element types

lib/std.lua.in

@@ -244,7 +244,7 @@ end
 -- @table std
 -- @field version release version string
 
-local export = base.export
+local export = require "std.debug".export
 
 M = {
   assert        = export "assert   (any?, string?, any?*)",