Merge branch 'master' of ssh://212.235.189.51:22122/codeq-problems

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	robot/problems/introduction/forward/en.py
	robot/problems/introduction/forward/sl.py

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+The file hierarchy for problem data is below. Comments indicate the global
+variables and functions that can be defined in each file. Only the ID is
+necessary. See existing problems for examples.
+
+<language>
+├── common.py              # id, hint_type, hint() [language-specific]
+├── en.py                  # name, description, hint [language-specific]
+├── sl.py                  # name, description, hint [language-specific]
+└── problems
+    └── <group>
+        ├── common.py      # id, number
+        ├── en.py          # name, description
+        ├── sl.py          # name, description
+        └── <problem>
+            ├── common.py  # id, number, test(), hint_type, hint() [problem-specific]
+            ├── en.py      # name, plan, hint [problem-specific]
+            └── sl.py      # name, plan, hint [problem-specific]
+
+To add a problem, create the necessary files. Pick an unused problem ID from
+the relevant range below:
+
+    Prolog: 10000-19999
+    Python: 20000-29999
+    Robot:  30000-39999
+
+Running scripts/build_web_resources.py in the codeq-server repo will generate
+JSON files for all problems, and insert new problems, groups and languages in
+the database.