[Bug 3605721]: Test independence fixes for binary-41.*
Don't panic if Tcl_ConvertToType is called for a type that doesn't have a setFromAnyProc, create a proper error message.
Don't panic if Tcl_ConvertToType is called for a type that doesn't have a setFromAnyProc, create a proper error message.
[Bug 3605120]: Stop test chan-io-28.7 from hanging when run standalone.
struct NextChannelHandler used only locally.  Remove from tclIO.h.
structs ChannelHandler ChannelHandlerEvent GetsState CopyState used locally.
Remove from tclIO.h.
structs *ChannelHandler* GetsState CopyState used only locally.
Remove from tclIO.h.
Remove from tclIO.h structs used only in tclIO.c.
merge trunk