[patch] improvements to the internal viewer

[Roland Illig]

This patch modifies the internal viewer as follows:

* provide functions for translating file offsets into
   line/column pairs and vice versa.
* display line/column in the status line.
* the F2 key does not switch between the text/hex
   sections in hexedit mode, but switches back to view
   mode. It is now a simple toggle, as the others.
* switching to wrap mode does not load the whole file
   into memory when using the growing buffer.
* provide a consistent set of cursor movement functions
* view_moveto_bol() and view_moveto_eol() work in text mode,
   too

Roland
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