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

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.

Renamed llsocks5.cpp to llproxy.cpp.

STORM-1112 First pass at cleanup of SOCKS 5 proxy code based on Linden Coding Standard and comments in the code review.

Still merging from server-1.25... one day I will catch up!

No conflicts

Result of svn merge -r107256:107258 svn+ssh://svn/svn/user/phoenix/license_2009_merge into trunk. QAR-1165

merge viewer_1-21 94770-96059 -> release

Result of svn merge -r71162:71205 svn+ssh://svn/svn/linden/branches/new-license into release. only changes files which are not deployed or the comments section of code.