Adaptive Database

Right now the project_variables_SAMPLE.php file, which is copied to create a working file, contains a hard-coded set of instructions for the db. These should be linked via an include somehow, because as the db code develops, the instructions change, and the ones in project files get out of date and have to be updated manually.

It looks as though search_instructions.inc is no longer needed. Check on this, and delete it from the repo if that's the case.

Currently, memory and time settings are in db/connect.php, which is a generic file shared by all projects. This requires modification of the file if a particular project has different requirements, which puts its working copy out of sync with the repo. Instead, these lines should be moved somewhere else -- possibly into local_classes.php:

ini_set("memory_limit","100M");
set_time_limit(120);