Merge downstream code

.hgtags

autobuild.xml

indra/edit-me-to-trigger-new-build.txt

indra/llcommon/CMakeLists.txt

indra/llcommon/lldeadmantimer.cpp

indra/llcommon/lldeadmantimer.h

indra/llcommon/llprocinfo.cpp

indra/llcommon/llprocinfo.h

indra/llcommon/llthread.cpp

indra/llcommon/llthread.h

indra/llcommon/lltimer.h

indra/llcommon/tests/lldeadmantimer_test.cpp

indra/llcommon/tests/llprocinfo_test.cpp

indra/llcorehttp/README.Linden

indra/llcorehttp/_httpinternal.h

indra/llcorehttp/_httplibcurl.cpp

indra/llcorehttp/_httplibcurl.h

indra/llcorehttp/_httpoperation.cpp

indra/llcorehttp/_httpoperation.h

indra/llcorehttp/_httpoprequest.cpp