* pmsleep refactor
* Shortened swtmr disabled message
* Added swtimer debug module option to user_modules.h.
* Added comments to user_config.h.
* Fixed error in documentation for node.sleep()
* remove blank sntp.c that got added in during rebase onto dev(6218b92)
* Added #ifdefs around SWTIMER_REG_CB to prevent inclusion of disabled
code
That file is supposed to only be included once because it does things
like declare static globals. As it stands, cron doesn't believe time is
ticking.
Fixes#2080
dnc40085
Philip Gladstone
Nathaniel Wesley Filardo
Yury Popov