AcceptanceTest: Allow Scenarios with parameterized style but with empty paramter names

1. Simplified documentation of the variable scope.
2. Acceptance test for the below issue:
This fixes a bug whith parameterized style scenarios where the paramters
have no name like:

|scenario | Division _ _ _ | numerator, denominator, quotient|

Previously this only woked with two spaces between each underscore. The
regex pattern has been fixed to work now with only one space.
TestCase: SyntaxErrors are now counted in the TestSummary

Acceptance Test for the below:
A table has a syntax error during parsing. E.g. a scenrio without a
name:

|scenario|

Also the table was marked as FAILED the test summary had zero failures.
Three things have been fixed now:
1. instead of FAILED the table is shown as ERROR/EXCEPTION
2. The test summary shows 1 exception
3. The error text which contains HTML is printed correctly (with the
HTML formatting)  in the table
 Pass output parameters from a decision table to the implementing scenario

Acceptance Test:
output parameters in a decision table have been ignored in scenarios.
Now they are available.