Import LinuxCNC source tree

tests/ilowpass/low-gain/README

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+Test that ilowpass's output gets all the way to its target, even with
+low gain.

tests/ilowpass/low-gain/expected

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+4
+0
+-5

tests/ilowpass/low-gain/test.hal

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+loadrt threads
+loadrt ilowpass
+addf ilowpass.0 thread1
+
+setp ilowpass.0.scale 1
+setp ilowpass.0.gain 0.1
+
+start
+
+setp ilowpass.0.in 4
+loadusr -w sleep 1
+getp ilowpass.0.out
+
+setp ilowpass.0.in 0
+loadusr -w sleep 1
+getp ilowpass.0.out
+
+setp ilowpass.0.in -5
+loadusr -w sleep 1
+getp ilowpass.0.out

tests/ilowpass/wrap-around/README

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+Test that ilowpass's output wraps around.  The magic -2147467296 is
+2147500000 - (2^32).

tests/ilowpass/wrap-around/expected

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+2147400000
+-2147467296

tests/ilowpass/wrap-around/test.hal

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+loadrt threads
+loadrt ilowpass
+addf ilowpass.0 thread1
+setp ilowpass.0.scale 100000
+setp ilowpass.0.in 21474
+setp ilowpass.0.gain 1
+start
+loadusr -w sleep .1
+getp ilowpass.0.out
+setp ilowpass.0.in 21475
+loadusr -w sleep .1
+getp ilowpass.0.out