The "/vdiff" page:
URL: /vdiff?from=TAG&to=TAG
Show the difference between two check-ins identified by the from= and to= query parameters.
Query parameters:
- from=TAG
 - Left side of the comparison
 - to=TAG
 - Right side of the comparison
 - branch=TAG
 - Show all changes on a particular branch
 - diff=INTEGER
 - 0: none, 1: unified, 2: side-by-side
 - glob=STRING
 - only diff files matching this glob
 - dc=N
 - show N lines of context around each diff
 - w=BOOLEAN
 - ignore whitespace when computing diffs
 - nohdr
 - omit the description at the top of the page
 - nc
 - omit branch coloration from the header graph
 - inv
 - "Invert". Exchange the roles of from= and to=
 
Show all differences between two check-ins.