consolidated most indra-specific constants in llcommon under indra_constants.h
fixed issues with operations on mixed unit types (implicit and explicit)
made LL_INFOS() style macros variadic in order to subsume other logging methods
such as ll_infos
added optional tag output to error recorders
* Removed check_curl_code and check_curl_multi_code from the global namespace.
* Added comments documenting which thread the public methods of LLProxy should be called from.
* Corrected grammar in LLSingleton.h
* Fixed a buffer scope problem in llpacketring.cpp.
* Removed early returns in LLStartup::handleSocksProxy
* Corrected some cases that would result in handleSocksProxy not being called again during login if settings changed
* Allowed for short replies in tcp_handshake in LLProxy.cpp
* Renamed LLProxy::isEnabled() to LLProxy::isSocksProxyEnabled() to clarify its use.
Oz Linden