testsuite: add bc and dc tests

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

testsuite/dc_boolean.dc

@@ -0,0 +1,27 @@
+0 1(pR
+1 1(pR
+2 1(pR
+_1 1(pR
+_1 0(pR
+_1 _1(pR
+_1 _2(pR
+0 1{pR
+1 1{pR
+2 1{pR
+_1 1{pR
+_1 0{pR
+_1 _1{pR
+_1 _2{pR
+0 0GpR
+0 1GpR
+1 0GpR
+_1 _1GpR
+0 _1GpR
+_1 0GpR
+1 1GpR
+238 2GpR
+0NpR
+1NpR
+_1NpR
+2398NpR
+_2983.2389NpR