DSL: rename "asserting" to "publish"

This should be more legible if there is less confusion with the
Nim "assert" builtin.

src/syndicate.nim

@@ -150,7 +150,7 @@ template onStop*(body: untyped): untyped =
     proc getCurrentFacet(): Facet {.inject, used.} = facet
     body
 
-template asserting*(a: Preserve): untyped =
+template publish*(a: Preserve): untyped =
   mixin getCurrentFacet
   getCurrentFacet().addEndpoint do (_: Facet) -> EndpointSpec:
     result.assertion = a

src/syndicate/drivers/timers.nim

@@ -29,8 +29,8 @@ syndicate timerDriver:
       if period > 0:
         getCurrentFacet().beginExternalTask()
         addTimer(period.int, oneshot = true) do (fd: AsyncFD) -> bool:
-          react: asserting: prsTimeLaterThan(deadline)
+          react: publish: prsTimeLaterThan(deadline)
           getCurrentFacet().endExternalTask()
           true
       else:
-        react: asserting: prsTimeLaterThan(deadline)
+        react: publish: prsTimeLaterThan(deadline)

tests/chat.nim

@@ -28,7 +28,7 @@ syndicate chat:
       echo who, " says ", what
 
   spawn "chat":
-    asserting present(me)
+    publish present(me)
     during (present(me)):
       let
         inputFacet = getCurrentFacet()

tests/test_dsl.nim

@@ -11,7 +11,7 @@ syndicate testDsl:
 
   spawn "box":
     field(currentValue, BiggestInt, 0)
-    asserting prsBoxState(currentValue.get)
+    publish prsBoxState(currentValue.get)
     stopIf currentValue.get == 10:
       echo "box: terminating"
     onMessage(prsSetBox(?newValue)) do (newValue: int):