aven: cleaned up plotting of crosses, special points, and highlighted points;
measuring line now snaps to the nearest point to the mouse pointer, not just
*a* point near the mouse pointer.
printps/printhpgl: Fixed --skip-blanks which would incorrectly skip non-blank
pages on rare occasions.
cavern: implemented "*units clino percent".
cavern: added error if the *units factor is zero (e.g. "*units tape 0 feet").
cavern: removed the ill-thought-out and never implemented LENGTHOUTPUT
and ANGLEOUTPUT quantities.
(Unix version): uninstalled binaries now use the path they are run with to
find support files, which means SURVEXHOME is no longer required, and has
been removed.
Rearranged messages a little to remove a few cavern messages in the middle
of the aven ones.
Removed a few needless inclusions of header files, and unused #define-s.
compile_error_skip() added to do compile_error() then skipline().
git-svn-id: file:///home/survex-svn/survex/trunk@1926 4b37db11-9a0c-4f06-9ece-9ab7cdaee568
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