docs: supported platforms

[Jon Lapham]

I added another item to the GC features list in the docs:

<para><emphasis>Multiplatform Compatibility</emphasis>: GnuCash is 
supported on a variety of operating systems and hardware platforms.  The 
list of fully supported operating systems (and platforms) for GnuCash 
v1.8.x is: GNU/Linux (x86, Sparc, PPC), FreeBSD (x86), OpenBSD (x86), 
Solaris (Sparc), and MacOS X (PPC).  Previous versions of GnuCash have 
been known to work with the following list, but their current status is 
unknown: SGI IRIX (MIPS), IBM AIX 4.1.5 (RS/6000), Unixware 7 (Intel), 
and SCO OpenServer 5.0.4 (Intel).</para>


I stuck it in the "Easy to Use" section... seem reasonable?  Any 
additions/subtractions?  I got this list from the main README file.

Oh, I don't like the title, "multiplatform compatibility" because I 
think (true?) that most people think in terms of their OS, not hardware 
platform....  suggestions?

-- 
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  Jon Lapham  <lapham at extracta.com.br>          Rio de Janeiro, Brasil
  Work: Extracta Moléculas Naturais SA     http://www.extracta.com.br/
  Web: http://www.jandr.org/
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