[PlanetCCRMA] added: pd externals and libraries

[Fernando Pablo Lopez-Lezcano]

Hi all, I've added a few pd externals and libraries to the repository.
No time yet to add the web pages but they are there:

* flext: a c++ framework to create pd externals
  includes built in support for stk and sndobj
* syncgrain: implements synchronous granular synthesis
* idelay: interpolating delay using flext layer
* fluid: fluidsynth external
* fftease: set of Live Spectral Processors
* dyn: dynamic object management
* percolate: includes a variety of synthesis objects, including physical
  modeling, modal and PhISM (Physically Inspired Sonic Modeling) class
  instruments

The usual "apt-get update" "apt-get install package_name" will bring
them in. More to come...

And also updated gltt to fix the Gem dynamic linking problem reported
earlier. 

Enjoy!
-- Fernando