Address some remaining hardcoded install prefixes

Ran a clean install of Evergreen on Ubuntu Precise and most things were
more or less working using simple "./configure; make; make install" with
the major exception of the TPAC. It turned out that there is a simple
variable that can be tweaked in the Apache config; a better way to
handle this might be to preprocess the source file at make time, but for
now at least we set the variable.

In addition, clean up two remaining scripts that have hardcoded paths.

Signed-off-by: Dan Scott <dscott@laurentian.ca>
Signed-off-by: Ben Shum <bshum@biblio.org>