API: only one conversion type indexed by a context object

CHANGES.md

@@ -1,10 +1,30 @@
 ## v1.11.0 UNRELEASED
 
+- Stdlib:
+  - triple, quadruple and quintuple data types
+  - char builtin
+
+- API:
+  - `ContextualConversion` module is gone.
+  - `('a, #ctx as 'c) Conversion.t` is the only datatype describing the
+    conversion for type `'a` under a context `'c` which is a subclass of
+    the raw context `#ctx`.
+  - `('i, 'k, #ctx as 'c) Conversion.context` is a datatype describing
+    the conversion for context `'i` indexed in the host application with keys
+    `'k`. A context items conversion can depend on a context as well.
+  - `BuiltInData.nominal` for nominal constants.
+  - `PPX` sub module gathering private access points for the `elpi_ppx` deriver.
+  - Conversions for data types such as `diagnostic`, `bool`, `*_stream`
+    moved from `Elpi.Builtin` to `Elpi.API.BuiltInData`.
+
 - Trace:
   - json output, with messages representing the tree structure of the proof
   - categorize spy points into `user` and `dev`
   - improve trace_ppx, revise all trace points
   - port to ppxlib
+  - commodity extension `[%elpi.template name args]` and
+    `let[@elpi.template] f = fun args -> code` attribute to perform
+    compile time inlining (can be used to circumvent the value restriction)
 
 - Build system:
   - cache ppx output so that it builds without ppx_deriving and trace_ppx

Makefile

@@ -29,7 +29,7 @@ DUNE_OPTS=
 build:
 	dune build $(DUNE_OPTS) @all ; RC=$$?; \
 	( cp -r _build/default/src/.ppcache src/ 2>/dev/null || true ); \
-	( echo "FLG -ppx './merlinppx.exe --as-ppx --trace_ppx-on'" >> src/.merlin );\
+	( echo "FLG -ppx './merlinppx.exe --as-ppx --cookie '\''elpi_trace=\"true\"'\'''" >> src/.merlin );\
 	exit $$RC
 
 install: