apps/nshlib:  The I/O buffer, g_iobuffer, should not be a global buffer.  That will not work in an environment where there are multiple NSH sessions.  The I/O buffer must, instead, be a part part of the session-specific data defined in nsh_console.h # Please enter the commit message for your changes. Lines starting # with '#' will be ignored, and an empty message aborts the commit.

apps/nshlib:  Add a new NSH losmart command.  losmart setups up a loop device for the smart MTD driver similar to losetup but with different syntax.  From Ket Petit.

apps/nshlib: Remove all references to internal OS interface netdev_foreach().  Logic in ifconfig, ifup, and ifown now use the procfs file system to examine networking status.

nshlib/:  ifconfig now uses /proc/net/eth0 to display network configuration.  You will need to enable the procfs file system in order to use ifconfig

apps/nshlib:  The 'ifconfig' command now uses /proc/net/stat to show network statistics.  A consequence of this is that you cannot view network statistics if the procfs is not enabled and mounted at /proc

NSH no long calls losetup() and loteardown() directly.  Now it uses /dev/loop and performs these operations using ioctl() calls

nshlib: Now that NuttX automatically converts block to character devices, the implemention of the DD command no longer has to muck with block to character conversion

Macros PR_BEGIN_EXTERN_C and PR_END_EXTERN_C were not defined in all contexts.  Remove definition and replace with explicit expansion.  From Stefan Kolb

apps/nshlib: Fix error handling in 'mv' command.  On a failure to expand the second path, the memory allocated for the expansion of the first path was not being freed.  From Bruno Herrera.

apps/nshlib: Fix error handling in 'cat' command.  On a failure to allocate memory, a file was not being closed.  From Bruno Herrera.

apps/system/netdb would not build unless CONFIG_NETDB_HOSTFILE was defined because it needed gethostbyname.  Noted by OrbitalFox

apps/examples/usbserial: Can now be run as an NSH builtin-function. Now uses a configurable IO buffer size

apps/tools/mkkconfig.sh:  The top-level Kconfig file is not auto-generated.  The autogenerated Kconfig file will be constructed so that every second level directory that contains a Kconfig file will automatically be sourced

readline():  A a configuration option to enable/disable command line history; Additional cosmetic changes from code review

readline/NSH: Extend the tab-completion logic so that NSH commands can also be completed by pressing the tab key