test: Initial testing framework

Configure with --enable-testtools.

BLD_ROOT is now the top build directory.

Current test requires ttynvt to be started (by root) like
 # BLD_ROOT/src/ttynvt -d -E -S localhost:1234 -n ttyNVT99
Device and server name parameters must be as shown above.

Run tests like
 $ make -C BLD_ROOT test 	# Builds the other programs too
 $ make -C BLD_ROOT/test	# Only running tests
 $ make -C BLD_ROOT/test V=1 RUN_OPTS="--gtest_filter=Test1.t1"

test/test.cpp

@@ -0,0 +1,70 @@
+/*
+ * General test stuff
+ *
+ * - The main() function
+ * - Some printing functions
+ */
+#include "test.h"
+
+int             debug = 0;
+
+static bool     ttyout = false;
+
+int main(int argc, char **argv)
+{
+    const char     *s;
+
+    ttyout = isatty(STDOUT_FILENO);
+
+    ::testing::InitGoogleTest(&argc, argv);
+
+    for (argc--, argv++; argc > 0; argc--, argv++)
+    {
+        s = argv[0];
+        if (*s++ != '-')
+            break;
+      again:
+        switch (*s++)
+        {
+        case 'd':
+            debug++;
+            goto again;
+        }
+    }
+
+    return RUN_ALL_TESTS();
+}
+
+#include <stdarg.h>
+
+void _pr_text(const char *col, const char *fmt, va_list args)
+{
+    char            fmtx[1024];
+
+    if (ttyout)
+        snprintf(fmtx, sizeof(fmtx), "%s[          ] -  %s%s\n",
+                 col, fmt, COL_RST);
+    else
+        snprintf(fmtx, sizeof(fmtx), "[          ] -  %s\n", fmt);
+    fmt = fmtx;
+
+    vprintf(fmt, args);
+}
+
+void pr_text(const char *col, const char *fmt, ...)
+{
+    va_list         args;
+
+    va_start(args, fmt);
+    _pr_text(col, fmt, args);
+    va_end(args);
+}
+
+void pr_info(const char *fmt, ...)
+{
+    va_list         args;
+
+    va_start(args, fmt);
+    _pr_text(COL_YEL, fmt, args);
+    va_end(args);
+}