Merged in chrishamm's changes to Network, PrintMonitor, and his support
for firmware updates from SD card
Fixed print monitor issue that threw out the layer count and time
estimates when there was an initial extruder priming move in the start
gcode
Fixed print quality problems that mostly affected delta printers e.g. on
spiral vase cylinder
When reconnecting a browser, cancel any file upload from the same IP
address
M111 now prints the number of each module with debugging enabled or
disabled
In special moves on delta printers, the F parameter is now interpreted
as the speed of the tower that moves the most
M114 now reports stepper positions as well as head position
Default to output in Marlin mode
M104 command defaults to the only tool if there is only one tool and it
is not selected
Trying different code for M999PERASE command to see if we can get it to
unlock flash and reset more reliably
When step errors are logged, report them immediately if Move debugging
is enabled. Also reports the total number of step errors in M122.
Changed interrupt priority to make tick interrupt higher priority than
step interrupt, because we rely on the tick interrupt to check for over
temperature conditions and kick the watchdog
Z axis min and max limits are now enforced if the axes have been homed
M665 command now shows the re-calculated delta radius and tower offsets
after auto-calibration
Initial and final RMS errors are now shown after delta auto-calibration
Pause/resume now mostly works when absolute extruder coordinates are
used
Doubled the maximum length of the SD card file listing that can be sent
to PanelDue
Implemented zpl's Network and PrintMonitor changes including M404
(thanks, zpl)
Increased default maximum instantaneous speed changes
Bug fix:: if M226 was used to pause the print, the resume coordinates
were not set up correctly
Bug fix: when changing the travel direction, the head was sometimes
slowed down more than necessary
Bug fix: warm-up time was not shown correctly in DuetWebControl
Bug fix: extruder drive positions were always shown as 0.0 in
DuetWebControl
Bug fix: incorrect PID parameters were shown in response to M301
Replaced old web interface files on SD card by DuetWebControl
Modified all resume.g files to set the speed when moving to the paused
head coordinates
