Since more and more information in now available through the CPU
registers, those require DLV_HOST access to be a bit better handled
than it is...

- in backtraces, (void) functions should be listed with '()' as arguments instead of ''
- factorized code for diplaying information about a local/parameter
- fixed a couple of bugs here
- rewrote format specifiers for print commands (do no waste space for padding data)
- added support for new wine's dbghelp extension for local/parameter
  variables being out of scope

They are stored internally as offsets to the start of the function
which embeds the block.

dbghelp: We can now remove the default name prefix as all the non conforming cases have been eliminated.

Got rid of dwarf2_find_name which is now useless.

(except for parameters which are converted into local variables).

Rewrote dwarf2_find_attribute so that it takes into account the
abstract origin information when available.

A+

(removed this feature for UDTs, structures' fields, enums, typedefs, compilands)

Make use of it to store the frame information for a dwarf function
(either because frame's location is a location list, or because one of
the function's variables is not properly computed at parse time).