misc IO_CACHE cleanups

* remove unused (and not implemented) WRITE_NET type
* remove cast in my_b_write() macro. my_b_* macros are
  function-like, casts are responsibility of the caller
* replace hackish _my_b_write(info,0,0) with the explicit
  my_b_flush_io_cache() in my_b_write_byte()
* remove unused my_b_fill_cache()
* replace pbool -> my_bool
* make internal IO_CACHE functions static
* reformat comments, correct typos, remove obsolete comments (ISAM)
* assert valid cache type in init_functions()
* use IO_ROUND_DN() macro where appropriate
* remove unused DBUG_EXECUTE_IF in _my_b_cache_write()
* remove unnecessary __attribute__((unused))
* fix goto error in parse_file.cc
* remove redundant reinit_io_cache() in uniques.cc
* don't do reinit_io_cache() if the cache was not initialized
  in ma_check.c
* extract duplicate functionality from various _my_b_*_read
  functions into a common wrapper. Same for _my_b_*_write
* create _my_b_cache_write_r instead of having if's in
  _my_b_cache_write (similar to existing _my_b_cache_read and
  _my_b_cache_read_r)
* don't call mysql_file_write() from my_b_flush_io_cache(),
  call info->write_function() instead

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