Resolution for Issue #50 (in nant/nant): now also checking
the "asis" count of a copy file set (next to other "includes")
before defaulting to adding all files and subdirectories.
Without this fix, a copy command referencing a fileset which
only has "asis" includes would have way too much files copied;
which might be hard to spot at first... as it is likely that
the file needed is also copied (and way too much other stuff).