added option --table/-t <tablename> to make ndb_desc try to find index.

Example,
ndb_desc -d test -t mytable 'myindex$unique'

The printing of Tables are moved into NdbDictionary.cpp
instead of NDBT_Table.cpp.  And methods for printing of
other NdbDictionary objects are added (using operator<<).

ndb_desc can print Index information.

HashMap are printed for Tables.

Value of FragmentType is now printed as text not number.