NSH initialization now calls boardctl(BOARDIOC_INIT) instead of board_app_initaliaze.  Modify all configurations:  Make sure that CONFIG_LIB_BOARDCTL=y appears wherever CONFIG_NSH_ARCHINIT=y appears.  Remove support for CONFIG_NSH_ARCHMAC.  It is not used and there are better ways to do that operation

SAMV7 Ethernet:  I- and D-Cache are now enabled in the netnsh/ configuration.  D-Cache is enabled in write-though mode.  This mode is necessary because the DMA descriptors are each 8-bytes in size but the D-Cache cache line is 32-bits in size. So it is impossible make coherency for every 8-byte DMA descriptor without write-through.

Make sure that FPU test, HID keyboard example, and touchscreen options are only available in the FLAT build

Fix two uses of DEBUG_COLORATION vs STACK_COLORATION (from David Sidrane).  Also some corrected comments

Fix some time value changes; mostly changing greater than 1000000000 to greater than or equal to 1000000000.  From Juha Niskanen

apps/examples/ostest: Sample errno on returns from sem_timedwait().  Otherwise, intervening system calls my change the value of the reported errno.  Noted by Juha Niskanen

apps/platform/Makefile:  Add a default defintion for DELIM.  Apparently it may not be present in certain causes during 'make distclean'.  From Michal Ulianko (SourceForge patch #47

NSH: The default priority of the network initialization thread should be lower.  It is CPU intensive and can interfere with other operations

apps/netutils/netlib:  Add utilities to convert to/from prefix lengths from/to 128-bit network masks.  Modify the NSH IPv6 ifconfig command to show the network mask in a more standard, human readable way.

ICMPv6:  Some initial bugfix from first tests of the ICMPv6 auto-configuration logic.  so far so good but a lot more testing is needed

Build-server sometimes fails 'make -j24' with:

 In file included from builtin_list.c:62:0:
 builtin_list.h:1:46: error: 'ts_engine_main' undeclared here (not in a function)
  { "ts_engine", SCHED_PRIORITY_DEFAULT, 2048, ts_engine_main },

or sometimes silently succeeds but generates builds that contain
a random subset of configured NuttX applications. There are two
root causes for this:

1) Recipes for building builtin_list.h and builtin_proto.h are not
   linearizable.
2) Nothing ensures that 'make context' is run first for apps/builtin

This patch addresses both issues.

Signed-off-by: Juha Niskanen <juha.niskanen@haltian.com>