Began to implement functions. Increased build number to 1. (1.2.2.1)
modified: Doxyfile (build number)
modified: Makefile (new files)
modified: Makefile.psp (new files)
modified: VERSION (build number)
modified: src/calculator.c (creates new function table)
modified: src/functions.c (code for creating a function table)
modified: src/include/calculator.h (added field for function table)
deleted: src/include/functions.c (mistake file)
new file: src/include/functions.h (code to define function structures)
modified: src/include/rpn.h (code to include functions.h)
modified: src/include/structs.h (circular definitons for function structs)