Test failures, fixes #21

[jranke]

This PR removes some code that turned out to be unnecessary (unloading and reloading the DLL in 'moveDLL'), and which does not work with current R-devel, presumably due svn commit r80285 addressing PR#16446. The commit message contains the phrase "Zero external pointers of native symbols of unloaded DLLs", and I do observe that unloading the DLL in moveDLL removes the pointer with current R-devel. So with this commit we do not unload the old DLL any more in 'moveDLL'. The only unloading that takes place now is in case a DLL is already loaded from the target location of 'moveDLL'.

I tested this locally with R 4.0.5 and current R-devel on Linux, as well as on r-hub (Windows, Ubuntu gcc and Fedora clang), all went well. I also uploaded to winbuilder - Dirk, you have probably received the e-mail.
I also tested 'mkin' which makes use of 'moveDLL', everything appears to be fine. I am not aware that any other packages use 'moveDLL' but we may still want to do reverse dependency checks before uploading. I have never needed to do this, so I do not have a workflow for it.

[jranke]

Sorry, I already bumped the version and set the date - I know this would be your domain - I just thought of that when I had already commited the updated DESCRIPTION.

[eddelbuettel]

Dirk, you have probably received the e-mail.

Yes, see here: #21 (comment) I actually got two. Both passes/

[eddelbuettel]

Sorry, I already bumped the version and set the date - I know this would be your domain - I just thought of that when I had already commited the updated DESCRIPTION.

Please just commit again and undo it for both date and version, or, if you must, set it to an intermediate value (i.e. just add a .1 and use today's date). Thanks.

[eddelbuettel]

Thanks a lot for working through the details -- that is really appreciated. I would simply have turned off the tests.

As I may have mentioned, 'deep down' I do not believe we actually can do this reliably, based mostly on a lot of tests with Rcpp and RInside a decade or longer. So things may have changed, but I doubt it. I expressed that way back when .e.g to the devtools team (or I guess these days this code is in pkgload) but they are of course entitled to their views too. For me it is simply easier to start a new R process, cleanly. No side effects.

That said, I appreciate how tricky the topic is and don't mind the extension to inline / support your code here as it seems to fit your needs. And it "generally" :) has no side effects apart from e.g. testing issues such as this, but you dealt with it very prompt;y. So all good.

I'll also run some tests but it sounds like to nixed this issue. So thanks!

[eddelbuettel]

Looks good