Various vim fixes.

Various vim fixes.

Change some mappings which conflict with plugins.

Unicode in Show_List().

When a new buffer was created BufEnter called Highlight_Signs() which
called Uncluttered_Buffer().  Most of the tests in that function don't
apply until the buffer is completely set up so move the initial call to
Highlight_Signs() to BufReadPost.

Show version in verbose statusline.

Added Extra_Columns() function to determine if column resizing is necessary.
Use it after setting listchars.

Fold up functions.

Use Prep_Sign() to shorten Prep_Signs().
Use Prep_Var() to shorten Iain_Vars().