Merge branch 'devel' into araq-misc

tests/testament/categories.nim

@@ -527,5 +527,9 @@ proc processCategory(r: var TResults, cat: Category, options: string) =
     # We can't test it because it depends on a third party.
     discard # TODO: Move untestable tests to someplace else, i.e. nimble repo.
   else:
+    var testsRun = 0
     for name in os.walkFiles("tests" & DirSep &.? cat.string / "t*.nim"):
       testSpec r, makeTest(name, options, cat)
+      inc testsRun
+    if testsRun == 0:
+      echo "[Warning] - Invalid category specified \"", cat.string, "\", no tests were run"

tests/testament/tester.nim

@@ -22,7 +22,7 @@ const
 
 Command:
   all                         run all tests
-  c|category <category>       run all the tests of a certain category
+  c|cat|category <category>   run all the tests of a certain category
   r|run <test>                run single test file
   html                        generate $1 from the database
 Arguments: