409.10 tests various conditions
409.11 testing various conditions - initial direction = true
409.12 testing various conditions - initial direction = false, do not adjust accumulator for direction reversals
409.13 testing various conditions - changes segment length computation
409.14 testing various conditions - hard-wire segment time to nominal segment time value
409.15 testing various conditions - 409.14 plus no step correction
409.16	// testing various conditions - 409.14 plus threshold = 4
409.18 testing various conditions - some refactoring on 409.16 - no functional changes - threshold set back to 1
409.19 testing various conditions - some cleanup
409.20 testing various conditions - removed section target corrections in _exec_aline_segment() (plan_exec) for testing error contribution. Also code rearrangement to take advantage of fixed-time segments.
409.21 testing various conditions - re-applied section correction
409.22 testing various conditions - mapped motor 3 (typically Y axis) to Z axis
409.23 recovery
Merge branch 'dev' into 409.13_exp
409.23 testing various conditions - Rework from time manipulations
409.24 experimenting with section target steps
409.25 experiments with _exec_aline_segment()
409.26 experiments with _exec_aline_segment()
409.27 rebaselineing; added counters and display for corrected step count
409.28 fixed bad position report at end of long run