alter online table T add partition partitions N

I now enabled SQL-interface to table-reorg.

The syntax (which is the same for other partition mgm) is
ALTER ONLINE TABLE T ADD PARTITION PARTITIONS N;

Also switched so that hashmap partitioning is used for all tables created using SQL.
And mysql-test-run works (including a new ndb_add_partition-test)
(except for some range/list partition testcases)

it's still kind of fragile. Error handling is sparse...

there are 3 known things which are easy to fix
- ndbapi transaction hinting/pruning does not work after/during a reorg
- unique indexes will not work after/during a reorg
- only 1 reorg per table is possible (SUMA caches distribution information incorrectly)

and one quite hard
- cluster crash *during* table-reorg

current plan is
1) fix 3 easy known problems
2) fix error handling
3) write detailed test program (pushed back again!)