border spacing issues

A few border spacing issues were reported to me, here is their analysis
and proposed fix:

The following test is hard to interpret when the text wraps:
   http://www.w3.org/Style/CSS/Test/CSS2.1/current/xhtml1print/t0805-c5516-ibrdr-c-00-a.xht

I've added line-height: 6em; to give the wide border some room in that case.

The following tests all fail if 'border-spacing' is zero (its initial value):
   http://www.w3.org/Style/CSS/Test/CSS2.1/current/xhtml1print/t0805-c5518-brdr-t-01-e.xht
   http://www.w3.org/Style/CSS/Test/CSS2.1/current/xhtml1print/t0805-c5519-brdr-r-01-e.xht
   http://www.w3.org/Style/CSS/Test/CSS2.1/current/xhtml1print/t0805-c5520-brdr-b-01-e.xht
   http://www.w3.org/Style/CSS/Test/CSS2.1/current/xhtml1print/t0805-c5521-brdr-l-01-e.xht
   http://www.w3.org/Style/CSS/Test/CSS2.1/current/xhtml1print/t0805-c5522-brdr-02-e.xht

For the top and bottom border tests, I added a rule to skip one of a pair of adjacent cells
so that there is no chance of a connection. For the others I added "border-collapse: separate;
border-spacing: 6px;" to the table.

If someone could please review the attached changes, I will check them in.

~fantasai