Make it possible to specify whether numeric ini settings are exact, minimum or maximum

[geoffreyvanwyk]

Some web applications need particular numeric ini settings have a minimum value, e.g. Moodle requires that max_input_vars should have a minimum value of 5000. If the value in the ini file is already 6000, then it should be left alone.

The php_ini_* variables should expect an additional dictionary property in its lists of settings which specify whether a value is exact, a minimum or a maximum. By default it should be exact.

This feature might be better implemented in the community.general.ini_file module.