Revert "Remove old handling of </>"

This reverts commit 99d9e2abbb.
Don't break backwards compatibility.

qutebrowser/keyinput/keyutils.py

@@ -277,6 +277,8 @@ def _parse_special_key(keystr):
         ('command', 'meta'),
         ('cmd', 'meta'),
         ('mod1', 'alt'),
+        ('less', '<'),
+        ('greater', '>'),
     )
     for (orig, repl) in replacements:
         keystr = keystr.replace(orig, repl)

tests/unit/keyinput/test_keyutils.py

@@ -447,6 +447,10 @@ class TestKeySequence:
         ('a<', keyutils.KeySequence(Qt.Key_A, Qt.Key_Less)),
         ('>a', keyutils.KeySequence(Qt.Key_Greater, Qt.Key_A)),
         ('<a', keyutils.KeySequence(Qt.Key_Less, Qt.Key_A)),
+        ('<alt+greater>',
+         keyutils.KeySequence(Qt.Key_Greater | Qt.AltModifier)),
+        ('<alt+less>',
+         keyutils.KeySequence(Qt.Key_Less | Qt.AltModifier)),
 
         ('<<', keyutils.KeySequence(Qt.Key_Less, Qt.Key_Less)),
         ('>>', keyutils.KeySequence(Qt.Key_Greater, Qt.Key_Greater)),