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Updated Manual
Turns out an out of date manual was on the sd card that was included with the printer. But it was definitely out of date, as it referenced UI items that don't exist, and files that weren't on the SD card.
An updated manual can be found here
or possibly out of date here
Resources and sample files
A very helpful Facebook group has a bunch of ...
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There is no "standard" g-code, especially for the auxiliary functions of calibration, and even more so for the calibration of delta-class printers. I find that the Reprap Wiki includes a fairly comprehensive list: http://reprap.org/wiki/RepRap_Firmware_G-Codes and http://reprap.org/wiki/G-code. These lists address the RepRap firmware, although they include ...
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Following on from Toon's answer, here is a run down of Thomas Sanladerer's excellent
video: 3D printing guides: Calibration and why you might be doing it wrong.
However, this may not be a definitive answer to the actual question about warts and bumps...
0:08 - A step back
Back in time - when the RepRap project (and the hobby grade 3D printing market) was ...
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