e2464c8572
Rewrote the YACC grammar, with help from Benjamin Franksen in formally defining the substitution file format in EBNF. This version also changes the way in which variables are added to the sub_collect string; previously it appended a ',' after every entry, and removed it off the end before calling dbLoadRecords(), but now we put the ',' at the beginning of each entry, and just offer dbLoadRecords() the string starting at the second character (not that this really matters, macLib will quite happily ignore either a leading or a trailing comma in the variable definition string). We now warn if there are substitution values for which we have no name, or if the file uses the deprecated syntax which permitted a bareword token in front of the variable substitution or pattern definition braces.
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