How to check if a certain module is installed

@markgromantigue if you’re asking how to do this in Java code, you would use something like

Module m = ModuleFactory.getModule("yourmoduleid");
if (m != null && m.isStarted()) { ... }

There’s also a getStartedModules method.

See: https://github.com/openmrs/openmrs-core/blob/2.0.1/api/src/main/java/org/openmrs/module/ModuleFactory.java#L545