added flags for GNU and Intel compilers to the cmake build rules
that generate KNL-specific instructions when the TARGET_KNL cmake
flag is set.

Defines a TRACE(...) macro that, when enabled at
compile time with -DWITH_TRACE, prints to std::cerr
the location in the source, a time stamp, and the
values of any variables given to the macro.

Uses a mutex to protect against simultaneous writes
to std::cerr when TBB is enabled; it is not
optimized for speed.

* add header only library TCLAP for parsing command line arguments
    - added as git submodule
    - update CMakeLists to include headers
* remove the ring model from miniapp
* add support for user supplied parameters for miniapp
    - arguments for cell counts etc can be command line flags
    - or in a user-defined json input file
* the all-to-all model supports synapses-per-cell is less than
  the total number of cells
    - in this case a random set of sources is selected

Sidesteps NDEBUG versus assert() issue; EXPECTS macros are
now enabled via a CMake configuration option -DWITH_ASSERTIONS=ON,
corresponding to the preprocessor define -DWITH_ASSERTIONS in
the code itself.

(Note, with assertions enabled, one of the existing tests in
test_algorithms.cpp aborts.)

* Add WITH_MPI CMake option to enable MPI code in application
* Use find_package(MPI) and set up flags, etc. for MPI
* Extra defines to disable the inclusion of C++ MPI headers for
  MPICH and OpenMPI.
* Fix signed/unsigned compare warning in algorithms.hpp

* Add file cmake/CompilerOptions.cmake for setting up compiler
  specific options
* Disable 'missing-braces' warning on Clang
* Avoid defect in g++ 4.9.2 standard library that omits move
  constructor for `stdd::ifstream`
* Remove signed/unsigned warning in test_optional.cpp

Add all directories with files to include to CMakeLists.txt
Make all linux folder based includes global (remove the folder structure)

Builds modcc from modparser as an external project;
executable will reside under BUILD/external/bin where
BUILD is the CMake build directory.

CMake hackery (see 'build_all_mods' target) should generate
required module .hpp files from .mod files before the
cellalgo library is built, if the header files are
missing or out of date.

This should also suffice for performing out-of-source
builds.

Begin iterator resets the input stream.

Adde `-g' flag in compilation to allow debugging.

Moved SWC parser's and cell record's implementation details to a
separate file. Also added braces around single-line control/loop blocks.