Enhance test system

- Tests are now named
- Testlogs are preserved between runs
- Tests can be run through Valgrind Memcheck tool

test/testdata/invalid

@@ -1,107 +1,108 @@
+==== empty ====
 ====
 1
 '[' or '{' expected near end of file
-========
+==== null ====
 null
 ====
 1
 '[' or '{' expected near 'null'
-========
+==== lone-open-brace ====
 {
 ====
 2
 string or '}' expected near end of file
-========
+==== lone-open-bracket ====
 [
 ====
 2
 ']' expected near end of file
-========
+==== bracket-comma ====
 [,
 ====
 1
 unexpected token near ','
-========
+==== bracket-one-comma ====
 [1,
 ====
 2
 ']' expected near end of file
-========
+==== unterminated-string ====
 ["a
 ====
 1
 unexpected newline near '"a'
-========
+==== unterminated-array ====
 ["a"
 ====
 2
 ']' expected near end of file
-========
+==== apostrophe ====
 ['
 ====
 1
 invalid token near '''
-========
+==== brace-comma ====
 {,
 ====
 1
 string or '}' expected near ','
-========
+==== unterminated-empty-key ====
 {"
 ====
 1
 unexpected newline near '"'
-========
+==== unterminated-key ====
 {"a
 ====
 1
 unexpected newline near '"a'
-========
+==== object-no-colon ====
 {"a"
 ====
 2
 ':' expected near end of file
-========
+==== object-apostrophes ====
 {'a'
 ====
 1
 string or '}' expected near '''
-========
+==== object-no-value ====
 {"a":
 ====
 2
 unexpected token near end of file
-========
+==== object-unterminated-value ====
 {"a":"a
 ====
 1
 unexpected newline near '"a'
-========
+==== object-garbage-at-end ====
 {"a":"a" 123}
 ====
 1
 '}' expected near '123'
-========
+==== unterminated-object-and-array ====
 {[
 ====
 1
 string or '}' expected near '['
-========
+==== unterminated-array-and-object ====
 [{
 ====
 2
 string or '}' expected near end of file
-========
+==== object-in-unterminated-array ====
 [{}
 ====
 2
 ']' expected near end of file
-========
+==== extra-comma-in-array ====
 [1,]
 ====
 1
 unexpected token near ']'
-========
+==== extra-command-in-multiline-array ====
 [1,
 2,
 3,
@@ -111,67 +112,67 @@ unexpected token near ']'
 ====
 6
 unexpected token near ']'
-========
+==== real-truncated-at-point ====
 [1.]
 ====
 1
 invalid token near '1.'
-========
+==== real-truncated-at-e ====
 [1e]
 ====
 1
 invalid token near '1e'
-========
+==== real-garbage-after-e ====
 [1ea]
 ====
 1
 invalid token near '1e'
-========
+==== integer-starting-with-zero ====
 [012]
 ====
 1
 invalid token near '0'
-========
+==== negative-integer-starting-with-zero ====
 [-012]
 ====
 1
 invalid token near '-0'
-========
+==== invalid-identifier ====
 [troo
 ====
 1
 invalid token near 'troo'
-========
+==== invalid-escap ====
 ["\a <-- invalid escape"]
 ====
 1
 invalid escape near '"\'
-========
+==== tab-character-in-string ====
 ["	 <-- tab character"]
 ====
 1
 control character 0x9 near '"'
-========
+==== null-byte-in-string ====
 ["\u0000 (null byte not allowed)"]
 ====
 1
 \u0000 is not allowed
-========
+==== truncated-unicode-surrogate ====
 ["\uDADA (first surrogate without the second)"]
 ====
 1
 invalid Unicode '\uDADA'
-========
+==== invalid-second-surrogate ====
 ["\uD888\u3210 (first surrogate and invalid second surrogate)"]
 ====
 1
 invalid Unicode '\uD888\u3210'
-========
+==== lone-second-surrogate ====
 ["\uDFAA (second surrogate on it's own)"]
 ====
 1
 invalid Unicode '\uDFAA'
-========
+==== unicode-identifier ====
 å
 ====
 1