This PR will tidy up the package to get it passing again on appveyor.
The principle change is that the proof-of-concept queue changes its implementation from being based on file locking with seagull (which will probably never go to cran as it proved not to be super reliable) to use thor (which is on cran since March).
Other changes just tighten up the QA checking, updates to deal with changes in testthat, remotes and appveyor.
This PR will tidy up the package to get it passing again on appveyor.
The principle change is that the proof-of-concept queue changes its implementation from being based on file locking with seagull (which will probably never go to cran as it proved not to be super reliable) to use thor (which is on cran since March).
Other changes just tighten up the QA checking, updates to deal with changes in testthat, remotes and appveyor.