tests/back2.pos,tests/back2.svx,tests/cavern.tst: Extend test of fore
and back sights to test calibration of the back compass.
tests/.gitignore: Ignore files produced by automake test machinery.
tests/: Move the annotations for each test case out of cavern.tst and
into a comment in the first line of the .svx file which is the input
for the test.
doc/manual.sgml: Remove $Id and $Date markers, as they don't get
expanded now we're using git.