The last change added .PRECIOUS: $(BIN) to everyway Makefile in hopes the libapps.a will not be deleted on Control-C (unproven so far).  However, $(BIN) may contain back slashes in some build platforms and that causes problems for make:  It can't handle the backslashes in the .PRECIOUS dependency list.  $(BIN) replaced with ../../libapp.a, where the number of ../ depends on the depth of the Makefile in the apps/ source tree.

All Makefiles:  Add .PRECIOUS: apps/libapps.a to every Makefile.  Hopefully this will end awkward problems when you Control-C out of a build and libapps.a is deleted.

Application.mk:  Add the .PRECIOUS target to prevent libapps.a from being deleted when the make is interrupted.

NSH addroute and delroute:  All expression of the netmask in IPv4 CIDR or IPv6 slash notation.  This really reduces the pain of using the commands, especially for IPv6.

NSH library:  Update addroute and delroute command.  The would support either IPv4 or IPv6, but not both.

netutils/netlib: Fix netlib_nodaddrconv() so that its return type is the same as other address conversion functions.  NSH: Correct parsing of ifconfig so that you can specify the HW address without specifying the IP address.

Implement powermonitor example for ltc4151 current and voltage monitor

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

apps/system/composite:  Remove references to USBMSC.  There still dependencies on CDC/ACM in the serial USB trace output.  That really should be removed.

ieee802154/i8sak:  Adds command to trigger regdump of radio

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

i8sak: Minor setting changes

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