configs/mikroe-stm32f4:  Add new configurations plus support for the MIO283QT2 display from Ken Pettit

Rearchitecting of some MTD, partition, SMART interfaces, and FLASH drivers to:  Better use the byte write capbility when available and to use smaller erase sectors for the erase sector size when available).

Add support for the byte write method to MTD partition logic;  Beef up the MTD partition test -- and fix resulting bugs detected

Automatically re-generated configuration variable documentation when NuttX release tarballs are created

Useless TIOCSERGSTRUCT logic in most serial drivers is not compiled unless CONFIG_DEBUG and CONFIG_SERIAL_TIOCSERGSTRUCT are defined