add spar

A modular math parser

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+Spar is a modular math parser that comes with a fully featured text frontend,
+something like an interactive calculator. It also provides a simple but
+complete API for C/C++ programmers. This API provide a complete interface to
+a top down parser that supports: variables, constants, functions, modules and
+a libc based math library. This math library overrides standard functions with
+a "custom" version (such as. deg, rad auto conversion, infinite symbol,
+function domain...). 
+
+Spar, can be easily extended with modules. A module is a "user" extensions,
+written in C/C++, to the basic features of the Simple Parser. Here you can
+find the module definition: is a C structure that contains only few data
+member: 
+    - module name 
+    - module version 
+    - module description 
+    - a pointer to the module main function 
+
+The modules are loaded at run-time by the module loader (that is a high level
+layer of the module manager): you can load your modules, simply, coping theirs
+paths into the .spar_modules (or any other file, with the -c option).
+
+WWW: http://spar.sourceforge.net/