Eliminate double names for coros + "empty name is main" convention.

Instead, introduce bool CoroData::isMain and test that. Use "main" for the
name of the main coroutine. That eliminates the logname() method, also the
llcoro::logname() free function. It also obviates the alternate CoroData
constructor.

Use boost::fibers::fiber::id as the LLInstanceTracker key for CoroData,
instead of the coroutine name. Introduce get_CoroData(id), also getName(id).
Extract static CoroData for the main coroutine to main_CoroData() so both
get_CoroData() overloads can use it.

Ditch unused get_CoroData(string) parameter: now get_CoroData().

Introduce LLCoros::mNameMap for lookup by name (e.g. killreq()). CoroData's
constructor puts an entry into mNameMap; the destructor removes it. Since
mNameMap is thread_local (unlike an LLInstanceTracker key), that theoretically
permits duplicate coroutine names on different threads.

Introduce mPrefixMap to help generate distinct coroutine names, instead of a
single scalar.

Introduce CoroData::getName(), and use it in both LLCoros::getName()
overloads. CoroData::getName() appends mStatus if it's not empty. This is
useful for disambiguating generic pool coroutines based on the current task.

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