Corese wrongly interpret final period as decimal point.

[pchampin]

Issue Description:

When an integer literal is followed immediately by the period ('.') terminating a triple,
the period is incorrectly interpreted as a decimal point.

Steps to Reproduce:

Parse the following turtle:

<tag:s> <tag:p> 42.
<tag:s> <tag:q> 43.

Expected Behavior:

It should be parsed as:

<tag:s> <tag:p> "42"^^<http://www.w3.org/2001/XMLSchema#integer> .
<tag:s> <tag:q> "43"^^<http://www.w3.org/2001/XMLSchema#integer> .

Actual Behavior:

It is actually parsed as:

<tag:s> <tag:p> "42."^^<http://www.w3.org/2001/XMLSchema#decimal> .
<tag:s> <tag:q> "43."^^<http://www.w3.org/2001/XMLSchema#decimal> .

(note that the character '.' is interpreted both as the decimal point and the period ending a triple, as the next triple is correctly parsed)