Integrate table-normalization xslt into tables.xsl

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Currently, the table-normalization step is done in a separate transformation 
before the main transformation. This requires additional glue code in perl to 
run this transformation. To simplify this, this should be done at the same time 
the tables are formatted in the tables.xsl.

Currently, a simple integration of the table-normalization into the main 
stylesheet leads to a number of unexpected results, either due to other 
(unrelated) templates matching, or some other overseen complication, which 
makes the trivial integration step (using a temporary node-tree in a variable) 
incorrect so far.

Original issue reported on code.google.com by jhellingman on 10 Sep 2014 at 5:29