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There is no need to keep optimized ECC functions in public namespace
(nettle_*), move them to internal namespace (_nettle_*).
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

In preparation to adding GOST curves support, rename source files and
use curve name as eccdata parameter.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204j/Cjagjjbc.html
The pre-UAL instruction is also accepted by modern assemblers.
Signed-off-by: Marcus Hoffmann <m.hoffmann@cartelsol.com>

Renamed directory armv7 to arm. New subdirectory arm/neon, for files
using neon instructions. configure.ac hacked to make use of neon
configurable.