Update Github templates.

Bug report: Slightly changes the wording and what versions we need.
Feature request: This can be free form text.
Pull request: Deleted in favour of simply having the commit title and
description.
Build failure: New, contains the information we need for build failure
and instructions on how to create a reproducer.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -8,24 +8,31 @@ assignees: ''
 ---
 
 **Describe the bug**
-A clear and concise description of what the bug is.
+Please give a clear and concise description of the bug. For us to be able to
+fix the bug we need to be able to reproduce it. As a result, if you provide a
+reproducer, i.e. code exhibits the bug (incl. build instructions) but is
+stripped of all unessential complexity, the chance of getting the issue fixed
+is much higher.
 
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Go to '...'
-2. Click on '....'
-3. Scroll down to '....'
-4. See error
+**Version Information**
+  - HighFive:
+  - Compiler:
+  - [optional] OS:
+  - [optional] CMake:
+  - [optional] HDF5:
 
-**Expected behavior**
-A clear and concise description of what you expected to happen.
+**Style Guide**
+1. Please paste text as text and not as a screen shot.
+2. If in doubt paste too much output rather than to little, i.e. don't be too
+   scared of a large wall of text. Especially, if it's a compiler error.
+   (Anything past the first error is largely uninformative and can be safely
+   stripped.)
+3. Please strip all boilerplate.
 
-**Stacktrace**
-If applicable, add a stacktrace and error messages to help explain your problem.
-
-**Desktop (please complete the following information):**
- - OS: [e.g. ubuntu 20.10, macos 10.15]
- - Version [e.g. master branch]
-
-**Additional context**
-Add any other context about the problem here.
+Markdown summary:
+````
+Some include `code` and a block:
+```
+void foo();
+```
+````

.github/ISSUE_TEMPLATE/build_failure.md

@@ -0,0 +1,54 @@
+---
+name: Build failure
+about: Report an issue with the build-system.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Bug Description**
+Unfortunately, build failures tend to be highly specific and there's many
+things that could go wrong on both our and your side. Therefore, a reproducer
+is essential. You could try the minimal setup found here:
+https://github.com/BlueBrain/HighFive/blob/master/doc/installation.md#manually-install-highfive
+
+from there you can work upwards by adding complexity until you reproduce the
+issue.
+
+Once you have a reproducer, please paste the exact `cmake` command used to
+configure the build and include the output. For the compilation phase please
+ensure that the actual compiler invocation is visible, e.g.,
+```
+$ cmake --build build --verbose
+[ 50%] Building CXX object CMakeFiles/dummy.dir/dummy.cpp.o
+/usr/bin/c++ ... -isystem ${HIGHFIVE_ROOT}/include -isystem ${HDF5_ROOT}/include ... -c dummy.cpp
+```
+and include at least the first error message. (If in doubt include more rather
+than less output.)
+
+**Version Information**
+  - HighFive:
+  - Compiler:
+  - OS:
+  - CMake:
+  - HDF5:
+
+**Style Guide**
+1. Please paste text as text and not as a screen shot.
+2. If in doubt paste too much output rather than to little, i.e. don't be too
+   scared of a large wall of text. Especially, if it's a compiler error.
+   (Anything past the first error is largely uninformative and can be safely
+   stripped.)
+3. Please strip all boilerplate.
+
+Markdown summary:
+````
+Some include `code` and a block:
+```
+void foo();
+```
+
+Links can simply be pasted:
+https://github.com/BlueBrain/HighFive
+````

.github/ISSUE_TEMPLATE/feature_request.md

@@ -7,14 +7,3 @@ assignees: ''
 
 ---
 
-**Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
-
-**Describe the solution you'd like**
-A clear and concise description of what you want to happen.
-
-**Describe alternatives you've considered**
-A clear and concise description of any alternative solutions or features you've considered.
-
-**Additional context**
-Add any other context about the feature request here.