Merge pull request #55 from franck-eyraud/master

UI: Improvements in ergonomics and styling.
FIX: Roll pleats in place instead of on right side.
FIX: Units are aligned and edit is done for the entire version.
FIX: Closed pleats' titles are not fixed anymore.
FIX: Correctly compute hexapla rows and cells.
FIX: Temporarily prevent from joining source units.
FEATURE: Textareas autosize when modified.
FIX: Optimized unit save.