Missing pieces:

- handle more text index entry types (extended charsets, alternate encodings)
  * MEDIUM
- handle row "updates": write row data back to current row, handling overflow
  * MEDIUM
- implement index creation
  * VERY HARD (still missing knowledge about all the magic bits in index meta
    data)
- implement table, column, index renaming
  * EASY
- implement table, column, index deletion
  * EASY - MEDIUM
- implement more comprehensive unicode compression write support