drivers/usbdev:  CDC/ACM should reset all 'irregular' notifications to zero after sending the SerialState packet.

include/nuttx/net/net.h:  Add missing semicolon in prototype.  Fixes error in certain combinations of configuration options.

stm32:stm32f40xxx I2C ensure proper isr handling

Injecting data errors that causes a STOP to be perceived by the
   driver, will continually re-enter the isr with SB not set and BTF
   and RxNE set.  This changes allows the interrupts to
   be cleared and  propagates a I2C_SR1_TIMEOUT to the waiting task.

Approved-by: Gregory Nutt <gnutt@nuttx.org>

In some cases, packets are still not sent behind the router. I found that NuttX sends the ARP requests not to the router but to the target. Mistake in file net/route/netdev_router.c.  From Aleksandr Kazantsev

STM32L4 ADC, DFSDM: add routing of ADC data to DFSDM filters

* configs/nucleo-l496zg: add DFSDM initialization

* STM32L4 ADC: add option for routing ADC data to DFSDM, fix DFSDM DMA

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Networking: drivers/net/loopback.c: Eliminate a warning.  net/netdev/netdev_ifconfig.c: Was not returning all of the address info.

    Networking:  Add implementation of logic for SIOCGIFCONF and SIOCGLIFCOF IOCTL commnds.
    Networking:  Add definitions and stuctures to support SIOCGIFCONF and SIOCGLIFCONF IOCTL commands.

viewtool-stm32f107:  Replace old stm32_appinit.c (now stm32_bringup.c) with 'standard' stm32_appinit.c from the STM32F4-Discovery.  Add CONFIG_BOARD_INITIALIZE logic to stm32_boot.c

STM32L4 DFSDM: add peripheral, DAC, TIM: small changes

* STM32L4 DAC: do not configure output pin if it is not used

* STM32L4 TIM: fix compilation of timers with complementary outputs when not PWM_MULTICHAN

* STM32L4 DFSDM: peripheral for digital filters for sigma-delta ADCs

    Initial version. Timer trigger support is not completed and there is
    some issue with DMA.

Approved-by: Gregory Nutt <gnutt@nuttx.org>

sched/env_dup.c:  Fix an error in the duplication of the child tasks environment in the special case where the parent's environment was created, but then all of the variables were unset.  In that case, there is still an allocation in place but the size of the allocation is zero.  This case was not being handled correctly when a child task attempts to create its environment and inherit the zero-size partent environment.  Noted by Anthony Merlino.

Add driver for APA102 LED controller.  These LEDs are used on LED Strips and are controlled over SPI.

Networking: sockgetname() files need to include udp/udp.h and tcp/tcp.h or otherwise NET_UDP_HAVE_STACK and NET_TCP_HAVE_STACK are undefined and the logic is never compiled.  Noted by Anthony Merlino

configs/stm32f4discovery: Update README.  Add summary of differences with the newest STM32F407G-DISC1 part.  Remove a lot of old discussion that is really no longer helpful.

    stm3240g-eval:  Add a configuration for testing the FB character driver at drivers/video/fb.c using the LCD frame driver front end at drivers/lcd/lcd_framebuffer.c.  Appears to be fully functional.

    stm3240g-eval:  Replace the old-style stm32_appinit.c with tne new one from the STM32F4-Discovery

    stm3240g-eval:  Rename stm32_appinit.c to stm32_bringup.c to better match other architectures

Fix some cosmetic stuff in the framebuffer character driver and in the LCD framebuffer driver front-end.

    configs/stm3210e-eval: Bring in new stm32_appinit.c, add board_initialize(), add support for FB character driver.
    configs/stm3210e-eval: Rename stm32_appinit.c to stm32_bringup.c so that the start up logic is compatible with other, new boards.

SAMv71-XULT:  Add a configuration to test the LCD framebuffer driver.  Not quite yet working properly.

drivers/lcd:  Add suppose for a generic front-end that will convert any LCD driver into a framebuffer driver.