Also added warnings:  There are some concurrency issues in the current implementation if you try to modify the procfs data structures will the procfs is mounted and possibly busy.

s/procfs:  The procfs file system can now be configured so that it supports a runtime registration of procfs entries with CONFIG_FS_PROCFS_REGISTER=y

Remove CONFIG_NET_PINGADDRCONF.  This was a uIP way of assigning IP addresses, but is not standard and not a appropriate feature in general.

Fixed error with temperature computation

fs/procfs:  Process status now includes task flags.  Some strings modified to improved 'ps' command output

sched/pthread/: CRITICAL BUGFIX: Logic was wiping out the indication that of the type of a pthread.  Hence, it could be confused as a task.  Found because this was causing a crash when /proc/nnn/cmdline was printed.

net/: Move net_procfs.c to net/procfs/.  Partition logic a little better to make space to support net device procfs as well

include/nuttx/net/netdev.h and several Ethernet drivers in arch/:  Most network drivers to not support statistics.  Those that do only support them when DEBUG is enabled.  Each driver collects an architecture specific set of statistics and there is no mechanism in place to view those statistics.  Thus, the driver feature was mostly useless.  This change standardizes the driver statistics and puts the definition in the common network device structure defined in netdev.h where they can be accessed by network applications.  All Ethernet drivers that collect statistics have been adapted to use these common statistics.