Massive re-org to allow per-executor job specification formats and executor-specific task validation and expansion.

A few different renames to try and keep things more consistent.

TODO.md

@@ -1,27 +1,30 @@
 Tasks
 ==
 
-- Open
-    - REST Server
-        - [ ] Add in authorization scheme (maybe PAM auth endpoint with JWT?)
-    - Core Functionality
-        - Allow `{{,!DATES}}` style interpolation, where values from `{{DATES}}` are preserved as a single, comma
-          separated list
-        - Executors
-            - [ ] Slurm Executor
-        - Loggers
-            - [ ] FileSystemLogger
-                - [ ] Add unit tests
-                - [ ] Add more error checking
-            - [ ] General logger
-            - [ ] Redis DAGRunLogger
-        - Server
-            - [ ] Multiple execution pools
-            - [ ] per-Executor parameters
-    - Utilities
-        - daggyd
-            - [ ] Add config file support
-            - [ ] Support for all the different executors / state loggers
-        - daggyc
-            - [ ] Submission
-            - [ ] Querying
+- REST Server
+    - [ ] Add in authorization scheme (maybe PAM auth endpoint with JWT?)
+- Core Functionality
+    - rename TaskList to TaskSet
+    - Add support for Task.runSpec
+        - Executors can validate runspecs
+        - Executors can expand runspecs
+    - Allow `{{,!DATES}}` style interpolation, where values from `{{DATES}}` are preserved as a single, comma
+        separated list
+    - Executors
+        - [ ] Slurm Executor
+    - Loggers
+        - [ ] FileSystemLogger
+            - [ ] Add unit tests
+            - [ ] Add more error checking
+        - [ ] General logger
+        - [ ] Redis DAGRunLogger
+    - Server
+        - [ ] Multiple execution pools
+        - [ ] per-Executor parameters
+- Utilities
+    - daggyd
+        - [ ] Add config file support
+        - [ ] Support for all the different executors / state loggers
+    - daggyc
+        - [ ] Submission
+        - [ ] Querying