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-1.lsl

@@ -0,0 +1,56 @@
+// Coverage tests of normal parsing
+f(){f();} // triggers FindSymbolPartial's last lines except the very last
+integer g(){if(1)return 1;else return 1;}
+integer T = TRUE;
+vector V = <1,-2,TRUE>;
+quaternion Q = <PI, 1.0, 0, 1>;
+list L = [];
+
+default
+{
+    timer()
+    {
+        integer i;
+        float f;
+        vector v;
+        // Parse_vector_rotation_tail
+        <0,0,0.1>1>;
+        // Parse_unary_postfix_expression
+        ZERO_VECTOR;
+        i = 1;
+        i += i;
+        f += i;
+        i -= 1;
+        i *= f;
+        i /= 1;
+        i %= 1;
+        v *= i;
+        ++v.x;
+
+        // Parse_bitxor
+        2^2;
+
+        // Parse_expression
+        1&&1;
+
+        // Parse_statement
+        @J;
+        1;
+        jump J;
+
+        // Scanner coverage
+        quaternion q;
+        1.3f;
+        0x0;
+        0x00000100000000;
+        4294967296;
+        42949672950;
+        L"\t\"";
+
+        1 // Not a string delimiter because it has \ at EOL:
+        "  \
+        // Not a string delimiter because it's the last double quote
+        // in the file:
+        ";
+    }
+}