Create empy chunks file, option to skip CSS.

Few improvements following code review:
- new option -E takes file name for empty chunk list, if specified and
  table is partitioned then empty chunk list will be stored in that file
- new option -C disable all CSS operations
- new feature - if both -s and -1 are specified then data is loaded into
  one table without partitioning even for partitioned tables
- improved logging, more INFO messages, all SQL queries are dumped with
  DEBUG level