Merge pull request #14 from jupacaza/master

Creation of cpp file with procedures.
Merge pull request #15 from jupacaza/master

with 'return' and 'while' corrections
all conditionalexpressions seem to work
With more tabulation checking
First implementation of Vispi functions
Error messages correction
With core functionality, still a lot to test
Fixed nested conditions\nAlso changed the cpp file name to vispi.cpp