Revert "Fix build on Solaris"

This reverts commit e212b64823219b74839c32e9bec90bf8d6d74ef3.
Fork osext and support Solaris
Spelling of Deprecated
Fix test configs to v5 format
Don't perform any further checks on too short IP numbers (fixes #764)
Perform initial scan asynchronously (fixes #509, fixes #464)
Tone down initial auto upgrade warning
Prepare for being able to start and stop folders at any time
Add file I forgot in previous