Issue in data import via IPM

[evshvarov]

There is an option to transfer files and import it then via IPM. E.g. in this package, that can setup a FHIR server and load test data via:
zpm "install fhir-server"

But it fails to load data due to transaction mode in IPM, investigated by @daimor
Current workaround is to install in a dev mode:
zpm "install fhir-server -dev"

or load from GitHub directly:
zpm "load Github URL"

Also the issue filed in the package

[isc-tleavitt]

Installing with -DNoTransaction=1 would work too.

The point of wrapping package installation in a transaction is to ensure that if installation fails, it's undone. We don't want to give an individual package a way to bypass this. A generalized solution to #439 to allow an Invoke to happen outside of the transaction, after installation has fully completed, would address this need as well; for now it's up to either documentation of install steps (using -dev or -DNoTransaction=1) or a package-level workaround.