ELF Tool Chain Code

Turn on SVN keyword expansion.

Ticket: #348

Add `$Id$` keywords.

Ticket: #348

Do not try to parse all the loclists in .debug_loc section during
dwarf_init() call, since it will take lots of time and memory space.
Instead, we should only parse a loclist when application request it.

Ticket: #312

Changes to error handling [part 2 of 2].

* Change macro `DWARF_SET_ERROR()` to take a `Dwarf_Debug` debug context
in its 1st argument. If a `Dwarf_Debug` debug context is unavailable
at the point an error has to be recorded, we use NULL. Actual error
handling is implemented by function `_dwarf_set_error()`.
* Change a few internal helper functions to take an additional Dwarf_Debug
parameter, for use with `DWARF_SET_ERROR()`.
* Replace the redundant use of `DWARF_SET_ERROR()` in `_dwarf_die_add()`
with `assert()`s; parameters `cu` and `abbrev` cannot be NULL if control
has reached this function. While we are here make the function "static".
* Use `DWARF_SET_ERROR()` consistently after a failed called to
`_dwarf_attr_find()`.

Reviewed and revised by: kaiwang27

* Implement consumer de-initialization functions for each DWARF info type.
* Implement producer de-initialization functions for each DWARF info type.
* Call all the consumder de-initialization functions in _dwarf_consumer_deinit().
* Add _dwarf_producer_deinit().

Renamed DWARF_E_INVALID_LOCLIST to DW_DLE_DEBUG_LOC_SECTION_SHORT.

Ticket: #20

Renamed DWARF_E_NO_ENTRY to DW_DLE_NO_ENTRY.

Ticket: #20

Renamed DWARF_E_MEMORY to DW_DLE_MEMORY.

Ticket: #20

Substitute DWARF_E_NONE with DW_DLE_NONE.

Ticket: #20

Remove redundant inclusions of system headers.

This change allows `libdwarf` to build on FreeBSD 6.

Reviewed by: kaiwang27