* do some plumbing to allow one to build from {mozilla,comm}-central
tarballs (aka alphas/betas)
* specialcase branch=~2.0 & branch=central for do-install: target and
sqlite dependency (the latter will be removed when we enable
UNLOCK_NOTIFY in systemwide sqlite)
* add --enable-profiling & --enable-debug-symbols to debug FLAVOR
* add a comment about why the builtin crashreporter is still disabled
(basically, google breakpad need to be ported to *BSD)
* add MOZILLA_VERSION to SUBST_VARS
0df9a857bc