2 bugs fixed

1) missing space in the generated rootmap file now inserted
2) classversion set according to "version" attribute name and not "ClassVersion"
Minor cleanup, fix of names matching logic

Some of the logic, although correct, was expressed in a complicated way. Simplifications were introduced preserving the same control flow: this improves readability and maintainability.
The names matching for XML files was not enabled: corrected.
Some verbose printout redundancies  were eliminated from rootcling.cxx