putting pairs: (), [] and {}

Starting to recognize the pairs: (), [] and {}. Also the tests to
end of file and one pair open was put; test to close a not opened
pair; and, a test to try the recognize of the characters
putting several tokens and tests

Adding several tokens. The OR_BIT and SEP tokens need a special care,
they are the unique tokens that are context-dependent. SEP is used to
split a list in two: head and tail. It's equal to the concept in PROLOG.