add tests for some observed issues

tests/decimals-balance-failure.test

@@ -0,0 +1,9 @@
+# b amount with no decimal places, in middle, causes balance failure (0.6.1)
+-f - print
+<<<
+2009/1/1 x
+    a         $1.25
+    b         $-1
+    c         $-0.25
+
+>>>2

tests/extra-date-slash.test

@@ -0,0 +1,8 @@
+# extra slash before [ silently breaks effective date (0.6.1)
+-f - print --effective -p 2009/1/2
+<<<
+2009/1/1/[=2009/1/2] x
+    a  1
+    b
+
+>>>2 /unexpected/

tests/print-preserves-comments.test

@@ -0,0 +1,18 @@
+# let's have print preserve comments as far as possible
+-f - print
+<<<
+2009/1/1 x  ; description comment
+    a  1  ; amount comment
+    ; middle posting comment
+    b
+    ; trailing posting comment
+; post-entry comment
+>>>
+2009/01/01 x  ; description comment
+    a             1  ; amount comment
+    ; middle posting comment
+    b
+    ; trailing posting comment
+; post-entry comment (?)
+
+