un-nixes ur lix, a little

I didn't really go attack the docs because we need to pull a bunch of
PRs. I went looking for strings in the code that called lix nix.

Change-Id: I2138bb4dd239096bc530946b281db7f875195b39

src/libcmd/repl.cc

@@ -186,7 +186,7 @@ ReplExitStatus NixRepl::mainLoop()
         if (state->debugRepl) {
             debuggerNotice = " debugger";
         }
-        notice("Nix %1%%2%\nType :? for help.", nixVersion, debuggerNotice);
+        notice("Lix %1%%2%\nType :? for help.", nixVersion, debuggerNotice);
     }
 
     isFirstRepl = false;

src/libexpr/print-ambiguous.cc

@@ -93,7 +93,7 @@ void printAmbiguous(
         str << v.fpoint;
         break;
     default:
-        printError("Nix evaluator internal error: printAmbiguous: invalid value type");
+        printError("Lix evaluator internal error: printAmbiguous: invalid value type");
         abort();
     }
 }

src/libstore/daemon.cc

@@ -1090,7 +1090,7 @@ void processConnection(
                 tunnelLogger->stopWork(&e);
                 if (!errorAllowed) throw;
             } catch (std::bad_alloc & e) {
-                auto ex = Error("Nix daemon out of memory");
+                auto ex = Error("Lix daemon out of memory");
                 tunnelLogger->stopWork(&ex);
                 throw;
             }

src/libutil/util.cc

@@ -47,7 +47,7 @@ extern char * * environ __attribute__((weak));
 
 
 #ifdef NDEBUG
-#error "Nix may not be built with assertions disabled (i.e. with -DNDEBUG)."
+#error "Lix may not be built with assertions disabled (i.e. with -DNDEBUG)."
 #endif
 
 namespace nix {

src/nix/main.cc

@@ -243,7 +243,7 @@ static void showHelp(std::vector<std::string> subcommand, NixArgs & toplevel)
 
     auto attr = vRes->attrs->get(state.symbols.create(mdName + ".md"));
     if (!attr)
-        throw UsageError("Nix has no subcommand '%s'", concatStringsSep("", subcommand));
+        throw UsageError("`nix` has no subcommand '%s'", concatStringsSep("", subcommand));
 
     auto markdown = state.forceString(*attr->value, noPos, "while evaluating the lowdown help text");