Sorting out some Erlang stuff:

- Rename a few Erlang-related ports using the erlang- prefix; it will avoid
  confusion with elixir- ports.
- Remove DOCS and EXAMPLES where not actually useful.
- Simplify RUN_DEPENDS where possible.
- Move textproc/exmpp to devel/erlang-exmpp.
- Add missing R18 compatibility fix for devel/erlang-oserl.
- Upgrade erlang-cuttlefish to 2.0.3.

The idea is that libraries ("deps") have the "erlang-" prefix, while larger
projects (rabbitmq, yaws, couchdb, etc) keep their usual names.

Compatibility fix for R18.

- Fix portlint warnings
- Use DOS2UNIX_GLOB to fix all source files

Remove $FreeBSD$ from patches files in categories a-j.

With hat:	portmgr
Sponsored by:	Absolight

Update ports in the [bcd]* categories to not use GH_COMMIT.

With minor cleanups to make things simpler.

With hat:	portmgr
Sponsored by:	Absolight

Cleanup plist

Convert to USES=dos2unix

With hat:	portmgr

- Switch to USES=gmake.
- Remove redundant GH master site.

- Add staging support.
- Do not mute install commands.
- Cleanup plist.

Add NO_STAGE all over the place in preparation for the staging support (cat:
devel part 1)

1. Introduce using iconv with arguments:
. lib (default, implicit);
. build,
. patch.

The default is the same, all existing ports stay valid.

2. Introduce variable ICONV_CMD with default to ${LOCALBASE}/bin/iconv.
It is intended to get the value of /usr/bin/iconv at recent 10.x.

3. Adopt all ports to using USES+= icomv:build and iconv:patch and
change iconv (executable) at Makefile commands to ${ICONV_CMD} at those ports.

Submitted by:	bsam (me, via e-mail)
Approved by:	portmgr (bapt)

Add common_lib, a library of Erlang functions used by oserl and
other projects.