added 'abort' & QSE_AWK_ABORT to awk.

added a new sed command 'C' that resembles the cut utility
dropped the cut utility.
added qse_str_nrcat()/qse_mbs_nrcat()/qse_wcs_nrcat()

qse/lib/sed/err.c

@@ -59,6 +59,7 @@ const qse_char_t* qse_sed_dflerrstr (
 		QSE_T("occurrence specifier zero"),
 		QSE_T("occurrence specifier too large"),
 		QSE_T("no previous regular expression"),
+		QSE_T("cut selector not valid"),
 		QSE_T("I/O error with file '${0}'"),
 		QSE_T("error returned by user I/O handler")
 	};