ARMv7-A:  Need 8-byte stack alignment when callign C code from interrupt handlers.  This change needs to be ported to other ARM architectures as well

Upate .gitignore files.  Add .dSYM. Make sure / is present where needed.  Add some missing .gitignore files

Fix STM32F1 and F3 USB device driver.  It was not handling NULL packets correctly and it prevent use of the driver with the CDC/ACM class

configs/hymini-stm32v converted nsh and nsh2 configs to use kconfig-frontends tools; Also converted to use the common SSD1289 driver

Convert olimex-lpc17stk configuration to use the kconfig-frontends tools; Fix some compile errors in the pl2303 USB device driver

LPC17xx GPIO interrupt fixes: lpc17_setintedge() must be atomic.  Can't disable interrupts from interrupt handlers because they are automatically re-enabled.  Try re-configuring pin instead.

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Move all memory manager globals to a structure.  Pass structure pointer as a handler because MM APIs

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Fix some bad syscall dispatching log.  This change is not testable until these is a tested NuttX kernel build.

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Moving pending signals to task group; Logic to recover some MQ resources on pthread_cacancel or task_delete; Now obeys rules for delivering signals to a process with threads

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Bugfix: whenever a thread  it must report the PID of the main task (even it is not the main task) with SIGCHLD

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Move atexit/on_exit data structures to task group; Now callbacks only occur when the final member of the task group exits

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New interface task_spawn(); exec_builtin() now uses task_spawn(); All argv types should be char * const * not const char **

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Add a start hook that can be setup to call a function in the context of a new thread before the new threads main() has been called.

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Fix some missing logic and inconsistencies in child status logic; Fix a bug introduced into sigaction()

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Finish dup logic for open files; fix bug in sigtimedwait(), would return wrong signo value if the signal was already pending

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Add support for dup2'ing files.  Infrastructure and ROMFS done.  Still need FAT, BINFS, NXFFS, and NFS

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