;github: new issue templates: more cleanups; solicit severity and likelihood estimates

(for ISSUES.md > Prioritising)

.github/ISSUE_TEMPLATE/a-bug.md

@@ -4,9 +4,7 @@ about: A weakness in the software, documentation, usability, or project
 labels: A BUG
 ---
 
-You can delete the following text before submitting.
-
-Thanks for your report! Some tips:
+Thanks for reporting! Here are some tips (please delete them before submitting):
 
 - Have you checked the hledger manuals, and the right version ?
   Eg for `hledger`: run `hledger help`, or go to
@@ -21,3 +19,21 @@ Thanks for your report! Some tips:
   - The output of hledger --version
   - What platform you're on
   - Links to any related docs that you found
+  - Estimates from 1 to 5 of
+
+    - How serious is this bug ?
+
+      - 5: Data loss or privacy/security loss. A user would drop the product.
+      - 4: Crash or bothersome regression or major usability or documentation issue. A user may look for an alternative product.
+      - 3: Installability, packaging or new user experience issue. A potential user would fail to get started.
+      - 2: Minor usability or documentation issue. Noticeable but easy to avoid / not a big deal.
+      - 1: Cleanup/design/developer issue. Significant only to developers and design-minded users.
+
+    - Who is likely to be affected by this bug ?
+
+      - 5: All users.
+      - 4: Most users.
+      - 3: A minority of users.
+      - 2: Only packagers or developers.
+      - 1: Almost no one.
+

.github/ISSUE_TEMPLATE/a-wish.md

@@ -4,9 +4,7 @@ about: A request or proposal for improving hledger or the project.
 labels: A WISH
 ---
 
-You can delete the following text before submitting.
-
-Thanks for your suggestion! Some tips:
+Thanks for your suggestion! Here are some tips (please delete them before submitting):
 
 - Have you looked for related features in the hledger manuals ? Eg:
   https://hledger.org/dev/hledger.html