Make C-cm fire up magit-status

This meant redefining some mail keyboard shortcuts which are now defined
as:

- C-xm     : compose mail
- C-u C-xm : compose mail from org subtree (org-mode)
             compose mail with current agenda item (org-agenda-mode)
Headers
Trailing spaces
Move identica configuration
ERC inline image configuration
This errors out on latex generate

I dont use it anyway, so deleted
instead of solved the problem
Spacing
Better use of latex, including a symbol definition
Further info on encrypting.