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Similar to the fixes relating to folder-creation and linking from #160, this PR provides a few minor improvements relating to folder-removal and unlinking, specifically:

• Show (slightly) more "humanized" error messages for failures/exceptions that occur while removing or unlinking a folder
• Schedule a tahoe restart after successfully leaving one or more magic-folders (in order to compensate for Tahoe-LAFS' "Zombie Dragon" issue)
• Schedule a rootcap rescan after unlinking one or more folders (instead of possibly during)
• Fix a weird issue in which RawConfigParser was erroneously caching old values from tahoe.cfg even after tahoe magic-folder leave had modified it causing folders to appear to be stuck in a "Loading..." state after restarting

Add and use remove_folder method; humanize errors

c5e0583

Add and use unlink_folder method; humanize errors

5076790

Accept an 'unlink' kwarg in remove_folder

8e2b45d

Use, determine 'unlink' kwarg from checkbox state

85235ce

Call maybe_restart_gateway after folder-removal

db42ff1

Cleanup

58d90ea

Schedule rescan -- not restart -- after unlinking

1927131

Fix a weird issue whereby Config.get() was somehow caching the value of
the magic_folder "enabled" option of tahoe.cfg -- even after the `tahoe
magic-folder leave` command removed the section/option from the file..

Use inlineCallbacks

f23e866

Call maybe_rescan_rootcap() after removes finish

1ee6ecb