Generate Apache config files for increased portability

Generate Apache config files for increased portability

Continue weaning ourselves off of hardcoded paths such as /openils in config
files. Also, install the Apache config example files into a docs directory
instead of just leaving them in the source tree. Similarly, remove some
hardcoded paths from eg_db_config.pl.

At the same time, drop the '.pl' suffix from the scripts that we're touching,
and make the Apache startup script a little less generic in name.

The change from "startup.pl" to "eg_startup" and from "eg_db_config.pl"
to "eg_db_config" also results in updates to installation and upgrading
documentation.

Signed-off-by: Dan Scott <dscott@laurentian.ca>