ELF Tool Chain Code

Changes to the `isa` utility:
* Use the `-D`, `-E`, and `-Q` options, to specify the mode the
utility is to operate in.
* Expand the description of the command modes supported by the `isa`
utility in the manual page.
* Implement the rest of the command-line parser.
* Add an EXAMPLE section to the manual page.

Ticket: #412

Add a `-h`/`--help` option to the `isa` utility.

Ticket: #412

Update the usage message printed by `isa`.

Ticket: #412

Improve the `isa` manual page:
* Improve the rendering of the tool's options.
* Note that "query" is the default mode of operation.
* Allow specificiations to be specified as command line arguments.
* Reword a paragraph for better clarity.

Ticket: #412

Fix a typo in the elf.3 manual page.

Fix typos in two `libelf` manual pages.

Submitted by: mark-jn
Ticket: #413

Improve compatibility with GNU ld: Do not complain about "no input
files" when option '-v', '-V' or '--verbose' is specified in the
command line and no input files are provided. Instead, the linker
should exit silently after printing version information.

Reported by: jkoshy

Do not add symbols that are converted to "local" by the version script
to the dynamic symbol table.

If a symbol matches both an version pattern with globbing and one
without globbing, pick the pattern without globbing.

Generate DT_VERDEF and DT_VERDEFNUM entries for the ".gnu.version_d"
section.