Add model and serd-sort utility

With all the new functionality, the complexity of the serd-pipe command-line
interface is starting to push the limits of available flags. So, instead of
grafting on further options to control a model, this commit adds a new tool,
serd-sort, which acts somewhat like a stripped-down serd-pipe that stores
statements in a model in memory.

This keeps the complexity (including the user-facing complexity) of any one
tool down, since other more focused tools can be used for streaming tasks in a
pipeline.

In other words, abandon Swissarmyknifeism, take a page from the Unix
philosophy, and try to expose the model functionality to the command-line in a
dedicated focused tool.  The model implementation is tested by using this tool
to run a subset of the usual test suites, and a special suite to test statement
sorting.

1 files changed, 4 insertions, 0 deletions

diff --git a/include/serd/serd.h b/include/serd/serd.h
index 77d1abf8..5d208d97 100644
--- a/include/serd/serd.h
+++ b/include/serd/serd.h
@@ -94,6 +94,10 @@
    @{
 */
 
+#include "serd/cursor.h"
+#include "serd/describe.h"
+#include "serd/inserter.h"
+#include "serd/model.h"
 #include "serd/nodes.h"
 
 /**