[Groff] A large hdtbl patch

[Larry Kollar]

I started fidding with the hdtbl macros, to see whether I could use  
them in place of tbl syntax, and have run into several issues. The  
attached patch does some serious hacking, so Joachim might need to  
bless this before committing it.

The biggest change is to hdmisc.tmac. I broke out all the page setup  
stuff into a separate file, because it was interfering with my page  
layout (common.roff, also attached), then fixed a bug in the .pv  
macro - I'm pretty sure the "s" and "v" registers should be ".s" and  
".v" - and patched all the example files to source common.roff.

After doing this, I found a couple more bugs, which might be the  
result of my hacking:

1) Tables look great, especially after fiddling with some of the  
defaults, but unless I put a .fl or .br in front of them, the last  
line of the previous paragraph floats below the table. Maybe there  
should be a "float" option to make it behave this way if desired. I  
was unable (even after many attempts) to find a good place to place  
a .fl request to fix this.

2) When starting a table with .TBL fsz='0.9', each cell in the table  
uses a smaller pointsize than the one before it... so the text in the  
last cell is really tiny!

The example files still format properly, so I don't think they're my  
bugs.

-- Larry

common.roff
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hdtbl.patch
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