* README: Update.
* wordsplit.3: Document changes.
* wordsplit.at: Test backward compatibility quirk.
* wordsplit.c: Make sure NULL and DELIM nodes are protected from
expansions.
(wordsplit_finish): Ensure the output array produced
with WRDSF_RETURN_DELIMS is consistent with that produced without this
flag. Provide new option, WRDSO_RETDELNOTEMPTY, to request old buggy
behavior.
* wordsplit.h (WRDSO_RETDELNOTEMPTY): New option.
* wsp.c: New tests.
* wordsplit.c (wordsplit_escape): New global.
(wordsplit_init): Backslash interpretation is disabled if
not expliticitly configured.
(wsnode_quoteremoval): Unquote unless _WSNF_NOEXPAND is set.
(scan_word): Fix backslash handling if WRDSF_QUOTE flags are set.
* wsp.c: Fix option handling.
* wordsplit.at: Test handling of C-style escapes.
* README: Document changes.
* wordsplit.3: Likewise.
This new feature makes it possible to expand variables with
dots or other unusual characters in their names.
* README: Update.
* wordsplit.3: Document the use of the ws_namechar member.
* wordsplit.c (is_name_char): New static function.
(ISVARCHR): Removed. Use is_name_char instead.
(_wsplt_seterr): Set errno to EINVAL if WRDSE_USAGE is returned.
(_wsplt_subsplit): Clear the WRDSO_MAXWORDS option in the subsplit.
Pass ws_namechar.
(wordsplit_init): Check for valid ws_namechar content.
(expvar): Take into account ws_namechar when scanning variable name.
Fix name length passed to the _wsplt_setctxerr call.
* wordsplit.h (ws_namechar): New member.
(WRDSO_NAMECHAR): New option bit.
* wsp.c: New options: -D to define an "extra" environment entry
(possibly containing characters not allowed by the shell), and
-namechar to define additional variable name constituents.
* wordsplit.at: Test namechar modifications.
