WIP: Make curl thread code robust and flexible.

Conflicts:

	indra/llmessage/llcurl.cpp
	indra/llmessage/llcurl.h
	indra/newview/app_settings/settings.xml
	indra/newview/llappviewer.cpp
	indra/newview/llmeshrepository.cpp

Resolved:

	indra/llmessage/llcurl.cpp:

	  Basically removed (not used anyway)

	indra/llmessage/llcurl.h:

	  Basically removed (just includes aiculr.h now)

	indra/newview/app_settings/settings.xml:

	  CurlUseMultipleThreads was remvoved.
	  CurlMaximumNumberOfHandles and CurlRequestTimeOut
	  are still in there, but unused at the moment.

	indra/newview/llappviewer.cpp:

	  CurlMaximumNumberOfHandles and CurlRequestTimeOut
	  are unused at the moment.

	indra/newview/llmeshrepository.cpp:

	  Lock mSignal always (is unlocked inside wait()).
	  Use mSignal lock to see if we are waiting; remove mWaiting.
	  Return false from the MeshFetch functions iff we have to retry
	  a HTTP fetch. Catch the error exception thrown by getByteRange
	  instead of using it's return value (always returns true
	  anyway).

indra/newview/statemachine/CMakeLists.txt

@@ -5,7 +5,7 @@ project(statemachine)
 include(00-Common)
 include(LLCommon)
 include(LLPlugin)
-include(LLMessage)		# This is needed by LLPlugin.
+include(LLMessage)
 include(LLMath)
 include(LLVFS)
 include(LLXML)
@@ -38,6 +38,7 @@ include_directories(
 
 set(statemachine_SOURCE_FILES
     aistatemachine.cpp
+    aicurleasyrequeststatemachine.cpp
     aifilepicker.cpp
     aifetchinventoryfolder.cpp
     aievent.cpp
@@ -47,6 +48,7 @@ set(statemachine_SOURCE_FILES
 set(statemachine_HEADER_FILES
     CMakeLists.txt
     aistatemachine.h
+    aicurleasyrequeststatemachine.h
     aifilepicker.h
     aidirpicker.h
     aifetchinventoryfolder.h