Changing this value broke the program, because the variable controls
the installation path of Perl modules, but the main binary uses a
constant, hardcoded path.
AMC will look for its libraries on the nix store path if and only iff
its default modules directory doesn't exist. The value for this
variable was /lib/, which exists on some systems. This commit changes
it to /nonexistent, the "canonical non-existent home directory" per
Debian policy, which probably won't exist anywhere.
Without this, AMC cannot export the results to OpenOffice. When one
presses "Reports->OpenOffice->Export", a dialog appears saying that
OpenOffice::OODoc perl module is not installed.
We switch to using makeFullPerlPath to make dependencies of
OpenOfficeOODoc also available. Without this, export complains about
missing XMLTwig.
Without this change, LaTeX run during "Update documents" (AMC-prepare)
phase complains about not finding automultiplechoice.sty. TEXINPUTS
should match TEXDIR value specified in makeFlags.
