equalize implementations of moveToX and moveToY
switched internal computations from TeX points (pt) to PS points (bp)
fixed issues in the doxygen documentation
set version to 1.5.3
updated NEWS
Added tag 1.5.3 for changeset 90f671880e1f
don't link GS messages unnecessarily if HAVE_LIBGS is defined
prevent calling dlopen() if the length of the string argument is 0
if libgs is loaded during runtime, look for libgs.so.X instead of libgs.so
moved lookup of MiKTeX's GS DLL to get_libgs()
added command-line option --zoom
only split hyperlink boxes on line breaks
changed default argument of option --linkmark to 'box'
added optional selection of line/box colors to option --linkmark
removed date and machine triplet from generated SVG files
set version to 1.6
removed redundant semicolon
updated NEWS
Added tag 1.6 for changeset 4b9ef65836df