Add several help topic aliases
Add several help topic aliases

Add aliases and choose the right help topic if the user requests help on
a key binding or a key binding label.

Signed-off-by: Lukas Fleischer <af90e31281d8305af43dc616c5aaca3c7165f8a7@cryptocrack.de>

lfos/calcurse,lfos/calcurse,lfos/calcurse