Added Date Format Functions. pAddr NULL Check
Node mgmt, added enum, modified functions

Node Management. Converted #define NODE_TYPE_* to enum.  Added function
to create a 'start of data' node.

Flash Mem. Removed #def NODE_TYPE_*

Firmware Builds
update doc strings flash_mem.c
update doc strings node_mgmt.c
Merge branch 'dev'
Merge pull request #57 from mikeneiderhauser/master

Added a few functions updated doc strings etc