r143478 -- gsl: update version 2.0->2.1

[David Evans]

On 12/15/15 6:52 AM, petr wrote:
> 
> The update to gsl @2.1 seems to have broken binary compatibility with dependent ports. So they need to be revision bumped. I see this for `nco` and `qgis` but there are very probably more. See below. 
> 
> ~petr
> 
> 
> {{{
> [...]
> --->  Installing gsl @2.1_0
> --->  Cleaning gsl
> --->  Removing work directory for gsl
> --->  Deactivating gsl @2.0_0
> --->  Cleaning gsl
> --->  Removing work directory for gsl
> --->  Activating gsl @2.1_0
> x ./
> [...]
> --->  Cleaning gsl
> --->  Removing work directory for gsl
> --->  Updating database of binaries
> --->  Scanning binaries for linking errors
> Could not open /opt/local/lib/libgsl.0.dylib: Error opening or reading file (referenced from /Applications/MacPorts/QGIS.app/Contents/PlugIns/qgis/libgeorefplugin.so)
> --->  Found 12 broken file(s), matching files to ports   
> --->  Found 2 broken port(s), determining rebuild order
> --->  Rebuilding in order
>      nco @4.5.3 +accelerate
>      qgis @2.12.0 +postgresql94
> --->  Computing dependencies for nco.
> [...]
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> 

Yes, I revbumped/updated some that I ran into and a few others have been updated since then but I think there are still
quite a few to go.  See my r143502-r143504, r143505, r143515-r143517.  Most only needed the revbump/update but a few are
broken due to probable API changes (#50017, #50024). Some are still broken from the update to gsl 2.0.

Dave