vimrc changes & bugs detected (not corrected):

  * updates maps to noremaps
  * and found 2 bugs
    - <C-J>, <C-K> keys overriden by some unknown plugin (sensible too,
      but not only)
    - sensible plugin changes somes colours, at least the 80 char
      indicator from magenta to grey
vim configs:

  change the Tabular.vim after-file, to the noremap standard added to
  .vimrc in the previous commit