Fix UG-2832HSWEG04 landscape.  Add reverse landscape support to UG_2864AMBAG01 and UG-9964HSWAG01.  Fixe NXHELLO default colors for 1-bit mono modes

Add support for the UG-2843HHSWEG04 OLED and for the SAM4L Xplained Pro OLED module that uses that OLED.

Straighten out issues about who calls C++ initializers with CXXTEST or HELLOXX are built as NSH applications; Add an ofstream test to CXXTEST suggested by Michael; Update many defconfig fiels to that they set configurations to handle C++ constructors just as before these configuration changes

Remove CONFIG_XYZ_BUILTIN configurations, replace with the single CONFIG_NSH_BUILTIN_APPS.  Add SAM3/4 sam_periphclks.h which is just a header file that includes the right header file.  Misc SAM3U-EK cleanup

Add missing NSH configuration settings.  Correct some conditional logic for STM32 FALSH pre-fetch settings.  From Lorenz Meier

Add apps/examples/slcd, Remove USB from STM32L-Discovery, LSE support for the STM32 L family, some STM32L-Discovery LCD debug changes

apps/examples/helloxx entry point name was mangled when built as an NSH builtin; plus some README updates

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

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Add support for a login script (in addition to the init script); Add logic so that a USB console session can connect and reconnect to the USB serial device

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