Improved (make install) to create directories like generic binary. 

If, after building the aped executable, you run (make install), make will now create a directory structure that resembles the "Linux generic binary" files as distributed on the APE Download page.

Also, bin/ape.conf has been renamed to bin/ape.default.conf. I did this for two reasons: 1) to avoid overwriting ape.conf in future installs and 2) to make it obvious that ape.default.conf must be customized to
the target environment before it can be used.

By default, (make install) now installs to /opt/APE_Server/. One can install to a different place by specifying a different value of the prefix variable, either in the Makefile or on the command line.