Unmap bufmru's <Esc> and 'y' mappings.

The <Esc> mapping gets in the way of terminal usage, and the 'y' mapping
occasionally gets in the way with yanking.
Add :Redir command to shorten :redir idiom.
Unmap all unneeded Bufmru keys.
Remove trailing whitespace.
Merge branch 'js/mine'
Removing bufmru unmappings that have been migrated to the common area.