- Adapted “Enhanced G29” code referred to in #1499 and posted at
[3dprintboard.com](http://3dprintboard.com/showthread.php?3105-Auto_Bed_
Leveling-Enhanced-G29-command)
- Compatible with current G29 while adding some new arguments
  - `V` sets the verbose level for serial out
  - `T` (or `V` > 2) send a Topology report to serial out
  - `E` works the same way as before
  - `P` works as before (source used `n` or `U`/`u`)
  - `L`, `R`, `B`, `F` work as before
- Still needs sanity checking for `LRBF`

The X_Axis could not home to min while Y_Max endstop was trigged.

Cleanup of cardreader.*

- Apply standards to cardreader.*
- Fix minor issues with cardreader.cpp
- Apply standards to some other stale regions

The encrot values are used in only one place, and don’t vary, so remove
redundant references.

Latest upstream changes

This reverts commit fb75a9272d.

Cleanup of temperature code

- Do field grouping
- Tweak configurations for better grouping

Fix undefined *_PROBE_BED_POSITION error

- Parse #if, #ifdef, etc. for rules to enable fields

Panel One encoder pins

Latest upstream changes

- Both TMC, L6470 and pin-driven drivers work.
- All can be mixed and matched as needed.

Merge upstream changes

Added support for PanelOne from T3P3.

Extend the idea of dummy temperature sensors.

Support for simple customisable AutoZProbing area

- Reduce calls to millis()
- General cleanup of manage_heaters
- General cleanup of pid autotune
- Formatting here & there
- Macros to clean up and shrink ISR code (reduced by ~364 lines)