* Add wifi.sta.clearconfig(). Adjust password validation to match 2.0.0 SDK rules (no min length enforced, i.e. for WEP)
* Updat comments about WEP key not having a minimum
* Documentation: add note about node.restore() to wifi.sta.clearconfig() docs, and add SDK verbiage to describe what node.restore() impacts.
* Normaliz if statements
* Convert leading tabs to leading spaces for consistency
* Corrected examples for negative values
See issue #1734
Negative values need to be treated differently. Changed all the samples to reflect that
* Update bme280.md
* Fix bug in sntp where callback was run at interrupt level. Also add
the nodemcu pool servers as the default.
* Add comments on where the mysterious numbers came from
* Fix a crash with auto repeat mode and errors on repeat
* Rewrite net.dns.resolve on LWIP
* Move IGMP (net multicast) to LWIP
* Cleanup net module
* Move secure connection operations to tls module
* Net module on LWIP
* Server timeout parameter
* TCP hold
* Fixes in documentation
* Documentation fixes
* Note TLS module depends on net
* Add TLS module to user_modules.h
* Callback on connect event
* Fix depends net module on tls module
* Fix unhold exponential time issue
* Check the return code of the read function when doing crypto.fhash so that we don't pass negative lengths to the hashing functions
* Fix various assert failures in the LVM arising from rotables. No functional change
* Add the gpio interrupt time to the callback (and pass it from the interrupt handler)
* Get the PC right in the perf module
* Make the headers static in the websocket module
* Fix the documentation
* Switch off interrupts before rtctime dsleep.
* Deal with the fact that MCU keeps running after being told to enter deep sleep
(It can keep running for quite a few instructions at times (and none at
all at others), and it appears that trying to cache additional code from
SPI flash while trying to go to sleep fails miserably at both....)
* Ensure flash is not active when going into deep sleep.
