Admin/Mercurial/filemap

double linking for improved performance of "prev";
misc tuning;

rename Doc doc-src
exclude Distribution/bin/Isabelle
exclude Admin/page/main-content/PG-preview.mov
exclude Admin/website/media/pg_preview.mov
rename Distribution .
rename CCL src/CCL
rename CTT src/CTT
rename Cube src/Cube
rename FOL src/FOL
rename FOLP src/FOLP
rename HOL src/HOL
rename HOLCF src/HOLCF
rename LCF src/LCF
rename LK src/LK
rename Modal src/Modal
rename Provers src/Provers
rename Pure src/Pure
rename Sequents src/Sequents
rename Tools src/Tools
rename ZF src/ZF