PX4-NuttX/nuttx branch test: px4-master_auto_rebase

NuttX:
 - https://github.com/PX4-NuttX/nuttx/tree/px4-master_auto_rebase
 - PX4/NuttX@2d5db5f

Changes from PX4-NuttX/nuttx (PX4/NuttX@6377532) in current PX4/master (aa270fc)
PX4/NuttX@6377532...2d5db5f

2d5db5f (HEAD, origin/px4-master_auto_rebase) [PX4: WIP] Fix transmission status handling in the serial interrupt
cd9e51e [PX4: REJECTED] cstdint fix
e1f66e0 [PX4: REJECTED] add math.h
601fd1e [PX4: WIP] Jenkinsfile
715d561 (origin/master) Trivial spelling corrections in comments; update some comments in a Kconfig file.
0786b5d net/tcp:  Re-think CONFIG_NET_TCP_RWND_CONTROL TCP windowing controls.
433f29e net/:  Rename CONFIG_TCP_REASSEMBLY to CONFIG_IPv4_REASSEMBLY.  Add some fixes to get a clen compile with CONFIG_IPv4_REASSEMBLY enabled.  There are several problems with the current implementation:  It is untested (and depends on CONFIG_EXPERMIMENTAL).  It uses some Ethernet specific definitions (and depends on CONFIG_NET_ETHERNET).  There is only a single reassembly buffer.  The last two issues prevent use of this feature in any context where IPv4 packets may be reassembled for multiple network devices concurrently).
fe592d5 include/limits.h:  Fix a signed-ness error introduced in a recent commit.  Documentation/:  Update acronym list.
34aeb08 Documentation/:  Remove some old, early prototype NuttX logo images.
1acfac3 net/:  More fixes to wrong comments from old change from the interrupt driven network to the work-queue driven network.

Apps:
 - https://github.com/PX4-NuttX/apps/tree/px4-master_auto_rebase
 - PX4/NuttX-apps@80e0cb8

Changes from PX4-NuttX/apps (PX4/NuttX-apps@36806ba) in current PX4/master (aa270fc)
PX4/NuttX-apps@36806ba...80e0cb8

80e0cb8 (HEAD -> px4-master_auto_rebase, origin/px4-master_auto_rebase) [REJECTED] add-var-expansion-in-nsh-parse.patch
0abe341 (origin/master) Merged in raiden00/apps (pull request #142)
3403b1b apps/nshlib/README.txt:  Clarify arguments to the mkrd command.
abcb66c Remove apps/interpreters/micropthon.  There are several reasons for this.  (1) the current version 1.3.8 is very old and no one is supporting it.  (2) the port only includes the core micropython logic and none of the Python libraries.  As such it is useless in any real application.  (3) There have recently been compile failures reported.  It looks like this is due to changes in newlib based toolchains that now bring in incompatible newlib header files.  See issue 104 at https://bitbucket.org/nuttx/nuttx/issues/104/build-micropython-138-error.  With no one dedicated to the support of micropython, it can no longer be carried in the NuttX apps/ repository.
36d6348 apps/nslib:  Try to eliminate and uninitialized variable warning.
e853fb4 apps/wireless/wapi:  Remove dependency on CONFIG_EXPERIMENTAL from Kconfig
133f239 Merged in raiden00/apps (pull request #141)
e4a30d5 apps/Make.defs:  Simplify last fix
bf23277 apps/Make.defs:  Fix an error introduced with recent chagne.  MKKCONFIG may not be defined resulting in failure to create apps/Kconfig.
36e04b3 apps/examples/gps:  Add GPS example using MINMEA lib