RT#3860
Reviewed-by: NTim Hudson <tjh@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: Andy Polyakov

Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

The disabled set of -Weverything is hard to maintain across versions.
Use -Wall -Wextra but also document other useful warnings that currently trigger.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Reviewed-by: NRich Salz <rsalz@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NAndy Polyakov <appro@openssl.org>

As part of this, remove some levitte examples that never were relevant.
Reviewed-by: NAndy Polyakov <appro@openssl.org>

Configure would load the glob "Configurations*".  The problem with
this is that it also loads all kinds of backups of those
configurations that some editors do, like emacs' classic
'Configurations~'.  The solution is to give them an extension, such as
'.conf', and make sure to end the glob with that.

Also, because 'Configurations.conf' makes for a silly name, and
because a possibly large number of configurations will become clutter,
move them to a subdirectory 'Configurations/', and rename them to
something more expressive, as well as something that sets up some form
of sorting order.  Thus:

    Configurations	->	Configurations/10-main.conf
    Configurations.team	->	Configurations/90-team.conf

Finally, make sure that Configure sorts the list of files that 'glob'
produces, and adapt Makefile.org.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Reviewed-by: NRich Salz <rsalz@openssl.org>

Move the build configuration table into separate files.  The Configurations
file is standard configs, and Configurations.team is for openssl-team
members.  Any other file, Configurations*, found in the same directory
as the Configure script, is loaded.

To add another file, use --config=FILE flags (which should probably be
an absolute path).

Written by Stefen Eissing <stefan.eissing@greenbytes.de> and Rich Salz
<rsalz@openssl.org>, contributed by Akamai Technologies.
Reviewed-by: NRichard Levitte <levitte@openssl.org>