111  * Calculate the abstract widths and decimal positions of columns in a
112  * table.  This routine allocates the columns structures then runs over
193 			 * of all groups of columns joined by spans,  in tblcalc()
214 	 * The minimum width of columns explicitly specified  in tblcalc()
263 		 * among the columns which may need expamsion.  in tblcalc()
278 		 * for any one of the narrowest columns,  in tblcalc()
279 		 * and mark the columns wanting that width.  in tblcalc()
323 	 * Count columns to equalize and columns to maximize.  in tblcalc()
324 	 * Find maximum width of the columns to equalize.  in tblcalc()
325 	 * Find total width of the columns *not* to maximize.  in tblcalc()
346 	 * Equalize columns, if requested for any of them.  in tblcalc()
347 	 * Update total width of the columns not to maximize.  in tblcalc()
364 	 * If there are any columns to maximize, find the total  in tblcalc()
365 	 * available width, deducting 3n margins between columns.  in tblcalc()
379 		 * manifests itself for large numbers of x-columns.  in tblcalc()
380 		 * Emulating it for 5 x-columns gives identical  in tblcalc()
381 		 * behaviour for up to 6 x-columns.  in tblcalc()