Updated .gitignore files
Fix test of range of skip= argument in NSH dd command.  From Ken Petit
Adding missing registration of /dev/zero; Condition registration of /dev/null.  From Ken Petit
Minor Freedom-KL25Z updates
Fix KL25Z clock definitions in board.h
KL25Z: Fix some memory mapp and register definitions; no UART3-5
KL25Z: Fix serial driver; freedom-kl25z/nsh configuration now works
KL25Z: No Ethernet, no SDHC.  TPM instead of FTM
KL25Z typos: AIPS, not APS or AIP
KL15Z: Fix GPIO base addresses; remove GCR header file
Remove up_assert_code
Various Kconfig files still have references to CONFIG_ variables.  Some in harmless comments, some in config definionts which is not harmless.  All removed
Useless TIOCSERGSTRUCT logic in most serial drivers is not compiled unless CONFIG_DEBUG and CONFIG_SERIAL_TIOCSERGSTRUCT are defined
Move task_terminate to its own C file to prevent drawing task_delete into the link
configs/freedom-kl25z: Change references to NuTiny to Freedom KL25Z
Prep for NuttX-6.27 release
Fix minor typos
Add option to zipme.sh to provide the build ID on the command line
Automatically re-generated configuration variable documentation when NuttX release tarballs are created
More improvements to zipme.sh tool