Dead, vestigial, and over-built code with no behavior change (except the
bool-vocabulary trim, a deliberate behavior tightening):
- httpdl: drop the vestigial sort+copy in validSegs (work-stealing was
removed in 270812d, so segments always tile [0,total) ascending now);
validate order in place, which also rejects a scrambled sidecar. Inline
the endOff() accessor to s.end.
- cli: shrink the boolean vocabulary to true/false, which is all that's
accepted. The invented yes/no/1/0/on/off spellings are gone, so e.g.
--enable-dht=yes (or yes in got.conf) is now a usage error.
- download: remove the dead, never-called Stat.Done() method.
- progress: drop speed(), a pure alias of humanSize; call humanSize directly.
- main: replace the jobsHolder mutex box with atomic.Pointer[[]job] for the
forced-exit session save; the capability stays, the lock and type go.
- bt: collapse isAddrInUse's X||X (missinggo.IsAddrInUse is that exact
string match); drop the now-unused missinggo import (tidy -> indirect).
- option: note that prealloc and falloc are identical here.
