Use arduino programming protocol by default for sanguino

Fix MELZI_MAKR3D to use correct motherboard

M120/M121 also set endstops non-homing state

Add Menu Items to initiate M303

Fixes for #3189

Setting a temp is still missing

Adds the parameter U to M303. If U1 is included , it will use the
PID-values from the auto-tune.

Follow-up the PR #3082, etc

Add support for Printrboard RevF

Make DISABLE_INACTIVE_X, etc., true if missing

Send position updates to RH

Patch minor spelling error in cn, en, gl language file headings

Fix lost undef Y_MAX_PIN in pins.h

Change link to the document

Fix Fan KICKSTART

Send position updates to RH where RH can not know the end position.

For example after G28 RepetierHost assumes to be at the homing-point,
but with a servo probe we are much higher. Now the RH-software-endstops
will prevent us from going down (if activated). With this patch the
internal position of RH is updated with `current_position[]`.

Sorting ot what else belongs to what if was not so hard.
But the static `ms = ms = millis();` was a bit surpising.

Patch-up to commits for Kana #3203.
Closes #3203.

Extend .gitignore

Improve Travis CI test

- Add shell scripts to help with managing configs
- Clean up .travis.yml file by using shell scripts
- Don’t download “astyle” – not needed and delays Travis results

Call buzz() directly from M428

Follow-up the PR #3082
Follow-up the commit 143ad74: unnoticed updates
Fix for commit b0f5ba0: Z offset: -front [of the nozzle] +behind -> Y offset: -front [of the nozzle] +behind
Standardize the writing method: Z-probe, z-probe -> Z Probe
Adjust spacing

documentation/LCDLanguageFont.md moved to http://www.marlinfirmware.org/ at commit 12d0983757,
but http://www.marlinfirmware.org/ isn't working.

Update the Hephestos 2 default config

fix spelling

Thermister -> Thermistor

Add pt_pt-utf8 language pack and fix some minor compiler warnings

follow-up the commit b82d91e

Fix extrudernum in MSG_INVALID_EXTRUDER

This is quite comprehensive. If probes are disabled in any case when they shouldn't be, I'm sure we will hear about it soon.

Delta-compatible extensions to M48

Added missing translations.

Stop print timer with M105/M109

Fix KEEPALIVE_STATE