Commits on Sep 27, 2018

1. Improve IsPackageLoaded …

   First off, it now aborts immediately if the package is not loaded, and
   doesn't call the package's `AvailabilityTest` function (fixes gap-system#2862).
   
   This was achieved by not using `TestPackageAvailability` anymore, but rather
   `IsPackageMarkedForLoading`. The main difference to the latter now is this:
   We now record whether a package fully completed loading (in particular, we
   record whether its `init.g` and `read.g` executed without an error). This
   information is then used by `IsPackageLoaded` after
   `IsPackageMarkedForLoading` returned `true`, to determine the final result.

   

   fingolfin committed Sep 27, 2018
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