[Savannah-dev] Update for Savannah installation documentation

[Donald_Adams]

The current documentation mentions two configuration files, local.inc.pl and its PHP counterpart. When I run './configure', 'make' and 'make conf', I get 'savannah.conf.pl' and its PHP counterpart. It would appear that either the names of the config files changed or there is something in the answers to my questions that caused the names to change. In either case, the documentation should be amended.

Thanks,
Don Adams