Squashed 'plugin/floo/common/' changes from 6f174a9..e4dd4bd

e4dd4bd Obey share_dir and base_dir options in ~/.floorc.

git-subtree-dir: plugin/floo/common
git-subtree-split: e4dd4bd7d909cd346057a881b15cb5e27b96fd59
Merge commit 'b7c3ad41084d55b1c0ecd66aa8282e4d41d9d580'