updated merged_datatype

I've uploaded a new document:
http://www.eda-stds.org/verilog-ams/htmlpages/public-docs/merged_datatype.pdf

to address these points from the minutes of 26 April:

Sri Chandra wrote:
> Review of Section 3.2 (strings)
>   - Geoffrey has modified this section to include the string datatype 
> from system verilog.
>   - typo on page-31 section 3.3.4 on the default word
>   - need to allow strings to be initialized through a string parameter.
>   - check the fonts on 'Str'.

Also, I noticed that the intro paragraphs said "genvar" was a new
construct, but it's now in 1364-2005.

-Geoffrey

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