Add the new test suite.

This test suite has been in use for a long time now, in place of the obsolete and unmanageable testparser.py and testfuncs.py. It verifies the complete optimizer output to stdout and stderr, to ensure that the output matches the expectations.

See unit_tests/README.txt for more info.

unit_tests/coverage.suite/lslparse-2.lsl

@@ -0,0 +1,57 @@
+// Test the extra features of the parser, to complete coverage.
+string S = "a" "b"; // juxtaposition in globals
+f(){}
+integer f(){return 1;}
+default
+{
+    timer()
+    {
+        // String juxtaposition coverage
+        "a" "b";
+
+        // Explicit cast and extended cast coverage
+        integer i;
+        float f;
+        list L;
+        f += i;
+        L += (integer)(float)i;
+        i = ~(integer)-2*3;
+        i = ~(integer)-2.*3;
+        i = ~(integer)-i*3;
+
+        // AllowKeyConcat coverage
+        ""+(key)"";
+        (key)""+"";
+
+        // Parse_statement with duplicate labels.
+        @J;
+
+        // does_something() coverage
+        switch(1)
+        {
+            {1;}
+        }
+
+        // loops, switch and break/continue
+        while (1) {break;for (;2;) {continue;break;} continue;}
+        do { continue; break 1; } while (1);
+        jump x;
+        while (1) @x;
+        jump y;
+        for (;1;) @y;
+        jump z;
+        do @z; while (0);
+
+        switch(1.0)
+        {
+            case 1: {1;}
+        }
+        switch(1)
+        {
+            default {}
+        }
+
+        while (1) continue;
+        while (1) while (1) while (1) continue 3;
+    }
+}