86, allow C-style comments in SQL statements

Added unit test TestSqlParser.testParsingCComments
Remove unused variable
Avoid unnecessary String.toUpperCase() calls

Save upper case column names one time instead of calling
String.toUpperCase() for every column of every row.

CsvJdbc now about 20% faster for common "SELECT C1, C2 FROM T"
type queries.
Merge branch 'master' of ssh://git.code.sf.net/p/csvjdbc/code

Conflicts:
	src/main/javacc/org/relique/jdbc/csv/where.jj
	src/test/java/org/relique/jdbc/csv/TestSqlParser.java