working version of updateidmap with Dropbox
adjust to insert in updateidmap
single file update of idfilepathdb and open hoodle file using file url in clipboard by openfileurl
relativitize file paths against hoodlehome
implement dbdiff
programs are installable by cabal-install
refactor DiffDB module, and redundant import clean up
half implementing dbsync
Merge branch 'master' of github.com:wavewave/hoodle-tools