"relative paths" option is enabled, 8.1 rewrites *every* path to be
relative to PCbuild (the dir containing the .wse script), even absolute
paths you type in by hand, paths to the Wise installation itself, and even
paths to the Windows directories (sheesh).  Only way to stop it is to
start a path with a variable reference, and we screwed ourselves before
by not using the predefined %_WISE_% vrbl to point to the Wise
installation.  Repaired that old, repeated and well-hidden mistake.
Also:
+ Got rid of the %_SRC_% vrbl (such paths always relative to PCBuild now).
+ Changed the %_DOC_% vrbl to prompt for the location of the unzipped
  HTML files (defaults to ..\html, cuz that's where I put them, but I
  expect I'll change that later cuz I always hated mixing the generated
  docs into the CVS tree ... Guido, if you're reading this, where did you
  unpack the docs when building a Windows installer?  Happy to oblige.).
+ Stopped the generated installer from filling up the entire screen (got
  rid of the massive blue background gradient -- new option).
+ Added the helpful app publisher and app URL registry entries that Win2K
  displays in its version of Add/Remove.