Provide better output on toltecctl uninstall

[Eeems]

• Provide output right at the end if a removal fails due to a preremove script. That way, the user can double-check the output to see if there is something bad. For example, kernelctl failed to revert to the stock kernel.
• Make changes to toltecctl to get closer to allowing the installation to be somewhere other than /opt, not that entware supports that yet.
• Make toltecctl uninstall handle unexpected states like partial uninstall a lot better.
• Backup toltecctl on uninstall to continue allowing users to uninstall if something goes wrong.
• Fix issues with installdepends not properly being set for several packages that caused them to be removed after their dependencies were removed, thus breaking uninstall.

[rM-self-serve]

I created a test package that will fail during preremove.
Do you have any tips on restoring /opt after uninstalling?

[Eeems]

I created a test package that will fail during preremove.
Do you have any tips on restoring /opt after uninstalling?

Uninstall removes /opt, which is actually /home/root/.entware. you will have to install again with bootstrap. If you want to avoid doing so, you can copy the .entware folder before doing the uninstall, rename the copy to .entware after uninstalling and then re-enable.