Vim: Clean up unused mappings, modify less frequently used ones.
Vim: <C-Space> rules them all!

Try omni-completion first, if available. When it fails, move to keyword
based completion. If any of the two returned results, focus the first
one.
Vim: Paste/Replace function.

Usage: cp{motion}

The contents of the replaced text are placed in the default register '"'

Example: cpiw  " paste over the current word.