replace llinfos, lldebugs, etc with new LL_INFOS(), LL_DEBUGS(), etc.

more fixes for unit test crashes
added llcommon initialization/teardown for unit tests
that indirectly trigger lltrace
changed access of atomic refcount to use preincrement/decrement
operators to reflect desired semantics
always call apr_initialize in LLCommon::initClass, even
if already initialized...apr does internal reference counting
to keep things straight

changed thread id declaration to be local to llthread.cpp and use
currentID() uniformly across platforms

fixes to merge

added LLThreadLocalPtr
broke llmutex out into llmutex.h
got primary sampling buffer under thread local storage