Merged changes from Trunk: mostly platform and compiler specific workarounds.
Set last merged revision no.
Fixed a mistake in error case explanation.
added laplace distribution
uadded laplace distribution
added laplace distribution
added laplace distribution
added laplace distribution
Corrected mistakes as reported by 

> On Behalf Of Ralf M.
> Sent: Monday, August 31, 2009 11:56 PM
> To: boost-users@lists.boost.org
> Subject: [Boost-users] [Math] Bug in example code / doc (Binomial Distr.)
Added desktop icon to setup distex
Merged changes from Trunk.
added missing newline at end of file.

Compiles OK with \Za disable SM extensions and NO warnings.